Mac upgrade to IOS 10.10 won't let me open pscs5.1, help?

After upgrading to MAC 10.10 I can't open pscs5.1, Can anyone help?

#1 I am NOT a rep for Adobe. I am a product user just like you. This is mainly a user-to-user forum. If you don't see a Staff badge next to the forum member's name, they do not work for Adobe.
#2 CS5.1 is no longer supported. That ship has sailed. If you want to keep using 4-1/2 yr old software, you need to pair it with a compatible operating system. If you want to upgrade PS, that's another option, too.
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I've posted about this and still continued to have trouble. If the super-initiated users out there would be willing to give me more advice, I'd be eternally grateful. I'm going to be as specific as I can to preemptively avoid confusion, as possible.
I ran a beige desktop G3 for years with OS 9.2.2. When it crashed (before I figured out how to get it back up with the help of this forum), I bought a stripped blue and white and 10.2(.8) from a local Mac store. I finally bit the bullet (my primary use is Pro Tools).
Between the beige's crash and receiving the blue and white in the mail, I was instructed how to start with apple-option-o-f restart commands and got the beige working again (with 10.2). It was fine. But since I had the blue and white with a faster processor, I was excited to get that going. So I took the hard drive (a 120 GB drive), my 320 mb of RAM (2 are clearly marked PC100, the third is marked "Hyandai" with no mark indicating of its PC100 or otherwise). But with this RAM and drive in the blue and white, the blue and white ran pretty smoothly. It was slightly glitchy though. Once in a while, a program would suddenly quit and there it was just a little buggy. But not bad. I decided rather than using the hard drive with the OS 10.2.8 installed on the beige, I would wipe the drive and install it on the blue and white to see if that solved the issue. That was the beginning of the end.
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It's been suggested to me that this is all an issue of RAM. The reason I question that is that the computer ran basically very smoothly prior to me reinstalling the OS. I've tried wiping and reinstalling again with no improved results.
I'd really like to be able to use the blue and white and not have to reinstall everything in the beige. And I am looking into getting more RAM. But I'm a poor musician and since this very same computer just as it is ran pretty well before, it's hard to believe that's the issue.
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This could be a complicated problem to solve, as there are several possible causes for it.
Back up all data, then take each of the following steps that you haven't already taken. Stop when the problem is resolved.
Step 1
From the menu bar, select
           ▹ System Preferences... ▹ Date & Time
Select the Time Zone tab in the preference pane that opens and check that the time zone matches your location. Then select the Date & Time tab. Check that the data and time shown (including the year) are correct, and correct them if not.
Check the box marked
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Step 2
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 login 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.
If the problem is not reproducible in safe mode, then it's caused by third-party "anti-virus" or "security" software. If you know what that software is, remove it as directed by the developer after backing up all data. If you don't know what it is, ask for instructions.
Step 3
Triple-click anywhere in the line below on this page to select it:
/System/Library/Keychains/SystemCACertificates.keychain
Right-click or control-click the highlighted line and select
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from the contextual menu.* An Info dialog should open. The dialog should show "You can only read" in the Sharing & Permissions section.
Repeat with this line:
/System/Library/Keychains/SystemRootCertificates.keychain
If instead of the Info dialog, you get a message that either file can't be found, reinstall OS X.
*If you don't see the contextual menu item, copy the selected text to the Clipboard by pressing the key combination command-C. Open a TextEdit window and paste into it by pressing command-V. Select the line you just pasted and continue as above.
Step 4
Launch the Keychain Access application in any of the following ways:
☞ Enter the first few letters of its name into a Spotlight search. Select it in the results (it should be at the top.)
☞ In the Finder, select Go ▹ Utilities from the menu bar, or press the key combination shift-command-U. The application is in the folder that opens.
☞ Open LaunchPad and start typing the name.
In the upper left corner of the window, you should see a list headed Keychains. If not, click the button in the lower left corner that looks like a triangle inside a square.
In the Keychains list, there should be items named System and System Roots. If not, select
          File ▹ Add Keychain
from the menu bar and add the following items:
/Library/Keychains/System.keychain
/System/Library/Keychains/SystemRootCertificates.keychain
Open the View menu in the menu bar. If one of the items in the menu is
          Show Expired Certificates
select it. Otherwise it will show
          Hide Expired Certificates
which is what you want.
From the Category list in the lower left corner of the window, select Certificates. Look carefully at the list of certificates in the right side of the window. If any of them has a blue-and-white plus sign or a red "X" in the icon, double-click it. An inspection window will open. Click the disclosure triangle labeled Trust to disclose the trust settings for the certificate. From the menu labeled
          Secure Sockets Layer (SSL)
select
          no value specified
Close the inspection window. You'll be prompted for your administrator password to update the settings.
Now open the same inspection window again, and select
          When using this certificate: Use System Defaults
Save the change in the same way as before.
Revert all the certificates with non-default trust settings. Never again change any of those settings.
Step 5
Select My Certificates from the Category list. From the list of certificates shown, delete any that are marked with a red X as expired or invalid.
Export all remaining certificates, delete them from the keychain, and reimport. For instructions, select
          Help ▹ Keychain Access Help
from the menu bar and search for the term "export" in the help window. Export each certificate as an individual file; don't combine them into one big file.
Step 6
From the menu bar, select
          Keychain Access ▹ Preferences... ▹ Certificates
There are three menus in the window. Change the selection in the top two to Best attempt, and in the bottom one to CRL.
Step 7
Triple-click anywhere in the line of text below on this page to select it:
/var/db/crls
Copy the selected text to the Clipboard by pressing the key combination command-C. In the Finder, select
          Go ▹ Go to Folder...
from the menu bar and paste into the box that opens by pressing command-V. You won't see what you pasted because a line break is included. Press return.
A folder named "crls" should open. Move all the files in that folder to the Trash. You’ll be prompted for your administrator login password.
Restart the computer, empty the Trash, and test.
Step 8
Triple-click anywhere in the line below on this page to select it:
open -e /etc/hosts
Copy the selected text to the Clipboard by pressing the key combination command-C.
Launch the built-in Terminal application in the same way you launched Keychain Access.
Paste into the Terminal window by pressing command-V. I've tested these instructions only with the Safari web browser. If you use another browser, you may have to press the return key after pasting. A TextEdit window should open. At the top of the window, you should see this:
# Host Database
# localhost is used to configure the loopback interface
# when the system is booting. Do not change this entry.
127.0.0.1                              localhost
255.255.255.255          broadcasthost
::1                                        localhost
If that's not what you see, post the contents of the window.

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2. Swipe the app's windows upwards to close
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Mac upgrade to IOS 10.10 won't let me open pscs5.1, help?

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