Re-installing apps on a mac

I'm using OS 10.8.5 and I need to reinstall an app purchased on the App Store.
Using the option key while clicking on the "installed" word under the app does absolutely nothing.
How can I reinstall the app?
Thanks.

Open the Mac App Store, sign into your account through the Store menu, go to the Purchases pane, and re-download apps from your previous purchases.

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Problem with Resuming and Installing Apps Purchased using Mac App Store

Recently I have been trying to download and install AeroFly FS which I purchased from Mac App Store (17GB) and with my internet connection it take some 4-5 days to download that.
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2) The app was 17GB ( I guess thats the installer), and I had some 25GB left after the download completed. But it gave an error saying while installing that not much disk space. So I moved/deleted many item on my drive and got the disk space to some 37GB Free. But it was still giving the same error of not much disk space.
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Hi ...
37GB of free space is not enough.
Right or control click the MacintoshHD icon. Click Get Info. In the Get Info window you will see Capacity and Available. Make sure there's a minimum of 20% free disk space.
Freeing Up Hard Disk Space - Mac GuidesFreeing Up Hard Disk Space - Mac Guides
OSX Tips Where did my Disk Space go?

If I do a clean install on my MacBook Pro will I be able to re-install apps (FCP, Aperture, MS Office etc.) from a Time Machine backup, or will I need the original install DVDs with authorization codes?

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You don't lose them. You can always redownload them from the app store after you log back in with your Apple ID.
"Buy, download, and even redownload.
You can install apps on every Mac you use and even download them again. This is especially convenient when you buy a new Mac and want to load it with apps you already own."

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Cannot install apps anymore or launch the Adobe Creative Cloud Client

Hey,
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Many users are reporting this issue as resolved. If you are still experiencing difficulties I would recommend reviewing Download error 403 launching AAM | CCM - http://helpx.adobe.com/creative-cloud/kb/download-error-403-launching-aam.html.

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http://www.apple.com/mac/app-store/
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AC

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So I've completed the solutions listed in the help article with no changes. Here is how it has gone with each solution listed in the article. Also, it is not clear in the article whether these steps are to be done in sequence or may solve the problem individually, but since Solution 1 fails for me, doing them in sequence was impossible.
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This did nothing.
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How do I download an app from the Mac App Store but not install it yet?

How do I download an app from the Mac App Store but not install it yet?
Can I simply download it and not install?
What if the App gets updated before I download it?
Why? Well, I am very busy and wish to install at my leisure even though I have purchased the App (required at a specific day in the month in order to appear on my business accounts).
Thanks.

There is a difference in what Kappy stated and what you stated. A major paid upgrade (v2.x to v3.0), yes, costs money, as it would in any other delivery stream. Updates (v3.0 to v3.1) to a a major version are free.
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Mac won't open newly installed apps.

I am trying to install and open apps from the Mac App Store, but nothing I installed today will open. Apps I already had are working fine, but when I try to install a new one the app appears in Finder and the Launchpad, but the app won't open. It also doesn't ask me to enter my Apple ID password. It gives me no notification about why it won't open. I restarted the laptop twice today (once for an update) and it didn't change anything. I have OS X Yosemite Version 10.10.3 and I'm using a MacBook Air.

Please read this whole message before doing anything.
This procedure is a test, not a solution. Don’t be disappointed when you find that nothing has changed after you complete it.
Step 1
The purpose of this step is to determine whether the problem is localized to your user account.
Enable guest logins* and log in as Guest. Don't use the Safari-only “Guest User” login created by “Find My Mac.”
While logged in as Guest, you won’t have access to any of your documents or settings. Applications will behave as if you were running them for the first time. Don’t be alarmed by this behavior; it’s normal. If you need any passwords or other personal data in order to complete the test, memorize, print, or write them down before you begin.
Test while logged in as Guest. Same problem?
After testing, log out of the guest account and, in your own account, disable it if you wish. Any files you created in the guest account will be deleted automatically when you log out of it.
*Note: If you’ve activated “Find My Mac” or FileVault, then you can’t enable the Guest account. The “Guest User” login created by “Find My Mac” is not the same. Create a new account in which to test, and delete it, including its home folder, after testing.
Step 2
The purpose of this step is to determine whether the problem is caused by third-party system modifications that load automatically at startup or login, by a peripheral device, by a font conflict, or by corruption of the file system or of certain system caches.
Please take this step regardless of the results of Step 1.
Disconnect all wired peripherals except those needed for the test, and remove all aftermarket expansion cards, if applicable. Start up in safe mode and log in to the account with the problem.
Note: If FileVault is enabled in OS X 10.9 or earlier, or if a firmware password is set, or if the startup volume is a software RAID, you can’t do this. Ask for further instructions.
Safe mode is much slower to start up and run than normal, with limited graphics performance, and some things won’t work at all, including sound output and Wi-Fi on certain models. The next normal startup may also be somewhat slow.
The login screen appears even if you usually log in automatically. You must know your login password in order to log in. If you’ve forgotten the password, you will need to reset it before you begin.
Test while in safe mode. Same problem?
After testing, restart as usual (not in safe mode) and verify that you still have the problem. Post the results of Steps 1 and 2.

Can't install purchased app on another mac

Attempting to mgirate from Snow Leopard to Lion. Need to install purchased applications from Mac App Store on the Lion partition. Signed in using same apple id as what I purchased the app with. According to the MAS help, you should be able to find the app in the store and click buy or free but the button shows "Installed". Also shows "Installed" in the Purchases tab. I can hide and unhide apps but can't redownload or reinstall an app I purchased.
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Thank you for your input.
When I installed Lion, it required me to enter my apple id and password which then verifies I purchased lion and am authorized to install it.
As soon as Lion (10.7.2) is done installing, I see that the mac app store shows I have updates with red badge even though I haven't signed into the store. It knows what apps I've previously installed and thinks those are installed in my clean fresh Lion installation.
There appears to be no way to redownload a purchased app that was previously installed. I can't believe I'm the first person finding this problem?!?!
I opened a case with Apple, spoke with a technician and he tried to remove file from Library but that didn't help. He had me create a test admin account and that had the problem too.
In MAS, I logged into a different apple id and it correctly showed no purchases but still showed updates available. Also showed apps installed that are not.
Apple technician asked me to reinstall Lion. I erased the partition and installed Lion again. Exact same behavior.
This is a tough one...

New hard drive installed on my 2009 mac book. Can I reinstall pages, numbers, etc... from the App Store? I was running Lion.

New hard drive installed on my 2009 mac book. Can I reinstall pages, numbers, etc... from the App Store? I was running Lion.

HI Corey ...
Yes. Make sure you use the same Apple ID.
How to re download apps from the Mac App Store:
Open the App Store. From the menu bar click Store > Sign In
Click Purchases from the top of the App Store window.
Select which apps you want to re download. Then right or control click where you see Installed then click Install.
Make sure and use the same Apple ID used for the original purchase.
If you can't re dowload the apps, launch iTunes. From the iTunes menu bar top of your screen click Store > Authorize This Computer. Sign out of the iTunes store and try re downloading your apps from the App Store again.

Re-installing apps on a mac

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