Why can't I download anything online? This includes itunes, applications from the mac app store, and flash plugins.

Why can't I download anything online? This includes everything from itunes song files,to Apps from the apple app store, to flash plugins. I am also unable to install a game on disk. I get messages that 0 kb is available when I just got the computer a week and a half ago and only installed microsoft office and adobe photoshop. Help!

This is a confusing complaint...and kind of disturbing. Perhaps you could answer a few questions:
1. How much space is left on your HD? If there weren't any available space left, it would be very difficult to boot your applications.
2. Do you back up at all? Given your situation, it might be a good time to start, given the situation. Backup drives are relatively inexpensive these days.
If this problem persists, a visit to your local Apple Store might be a good idea - but until then, please let the community here help.

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I recently purchased adobe indesign I'm trying to download it but i'm getting a message that's saying “Install.app” can’t be opened because it is from an unidentified developer. Your security preferences allow installation of only apps from the Mac App Store and identified developers.

System Preferences / Security & Privacy / General tab.
Change the settings at the bottom half of the window.

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macjack gave you the easiest solution. Need to have admin privilieges to change this option.

Help! How do I download software for a HP Laserjet Professional P1100? I keep getting the same message when I have downloaded the file "Your security preferences allow installation of only apps from the Mac App Store and identified developers" Help!

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You can change the settings in Security & Privacy to "Anywhere"...
That should work... as to whether the printer driver will work, that's another question.
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I have downloaded a paid app from the mac app store and accidentally deleted it from purchases. how can i get it back?

exactly what the title says.

On the menubar, App Store > Store > View Account > Sign in > click on View Hidden Purchases.

HT4906 I PURCHASED THE LATEST VERSION OF IPHOTO FROM THE MAC APP STORE, AND WOULD LIKE IT TO WORK ON THREE OF OUR COMPUTER'S. HOW CAN I DO THAT.

If I purchase the latest version of iphoto from the Mac app store on my Macbook Pro, how do I get it to run on my two other Mac computers, which are desk top computer's?

Sign into the App Store on each computer that does not have iPhoto. Use the same Apple ID used to purchase it. Locate iPhoto in your Purchased list and click on the active Install link.

I baught an app from the mac app store and it is damadged but I cant delete it and download a new one?

I baught an app from the mac app store that is damadged. When I open the app it says to delete it and redownload it, but when I open the launch pad and hold down on the app there is no x beside it. I also cant drag it into the trash.

What app was it you purchased?

Error message when I try to download new iTunes as follows iPhoto 7.1.5 is already installed and was not purchased from the Mac App Store

I am trying to download new version of iTunes from App store having purchased it on my laptop. When I try to download on my iMac I get the following message:
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Thank you.

Make a back up of your Library. Now you can update without fear.
Regards
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You need to upgrade to OS X Mavericks first, as the most recent iLife versions are only compatible with OS X Mavericks.
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I get the message "Install Adobe Flash" can't be opened because it was not downloaded from the Mac App Store. This is the first time I have gotten the message. What do I need to do?

I get the message "Install Adobe Flash" can't be opened because it was not downloaded from the Mac App Store. This is the first time I have gotten the message. What do I need to do?

Hi Sandra,
you'll need to edit the security settings to install programs 'Mac App Store and identified developers'
Open the Systems Preference and go to Security & Privacy. There will be a section in the 'General' tab for 'Allow apps downloaded from:" The default selection is 'Mac App Store'. Change this setting to 'Mac App Store and identified developers".
This screenshot is taken on OS X 10.10 (Yosemite), so it may look slightly different if you're on a different OS X version.
Maria

This message appears whenever I try to open a file downloaded from internet: can't be opened because it was not downloaded from the Mac App Store

Just bought a new Imac OX 10.9. Installed contents from previous Time Machine. All looks good. But, now, when I try to open any file downloaded from interent (like the Amazon mp3 downloader, for example or a plugin update) I get this message:
"XXX can’t be opened because it was not downloaded from the Mac App Store" . Help! Thanks

Got it solved! System preferences, security & privacy icon, general: allow apps downloaded from Mac Store and Identified developers! Phew!

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Anyone has the problem of not being able to buy anything from the Mac App Store. It is extremely annoying. It does not show any error messages. When I click on the "Buy App" icon it does't go anywhere. its so annoying and disappointing. Tried it from two computers, mac pro and macbook pro.

Disable anti virus software and try turning off the Firewall in System Preferences > Security & Privacy.

Can't download from the Mac app store

Hi,
I was wondering if anyone else is having this issue. Anytime I try to download an app free or paid from the mac app store it goes to my doc but it doesn't download it just sits there and says it's waiting. also when I have an update for an app I click on it and enter my apple id and pass to update and nothing happends. the store worked when I first got it and then one day it just stopped.
how can I fix this? Do i have to reinstall the app store? I am running the latest version of snow leopard on a core i7 macbook Pro (early 2010) I also checked my firewall settings and nothing is blocking it from working.
Thanks

Then I would first try trashing these files and folder;
~/Library/Preferences/com.apple.appstore.plist
~/Library/Preferences/com.apple.storeagent.plist
~/Library/Preferences/ByHost

Why do I get a "can't import spreadsheet because it was created with an unsupported application version" alert when the updated version was purchased direct from the Mac App Store? The spreadsheet is now lost somewhere!

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Pages 4.3 should still be in an iWorks folder within your Applications folder.
http://www.apple.com/feedback/pages.html

""Install Adobe Flash Player.app" can't be opened because... not downloaded from the Mac App Store"

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You're running up against the GateKeeper.
Download the offline installer: Flash Player 12.0.0.44 (Mac OS X) by right clicking and choosing "Download Linked File As".
Mount the DMG and when it opens, right click the installer and choose "Open".
You'll see a warning. Click "Open" again.
It will run from there.

Why can't I download anything online? This includes itunes, applications from the mac app store, and flash plugins.

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