Photoshop CS6 won't open all of a sudden

chrismig5, good morning.

Please refer to the following help (in Japanese).

CreativeCloud契約終了後、シリアル番号インストールしたCS6が起動不可になってしまう場合の対処

* This article is an English translation of the article.

Solution 1
■ When CS6 product can be started:

1. After starting CS6 product, click Help> License Activation.

2. Quit the CS6 product and restart the PC once.

3. Launch CS6 product, and when you are asked to login, newly created AdobeID,
You will need to log in with an Adobe ID that has never signed a Creative Cloud contract and authenticate with a serial number.

・ How to create an Adobe ID

https://helpx.adobe.com/manage-account/using/create-update-adobe-id.html#HowtocreateorupdateyourAdobeID

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■ If the CS6 product cannot be started:

1. If there is an application called Adobe Creative Cloud in the application list, it will start.

2. Click the gear mark at the top right of the screen, click Preferences, and press the logout button.

3. Restart your PC once.

4.Launch CS6 product and ask for login
You will need to log in with an Adobe ID that has never signed a Creative Cloud contract and authenticate with a serial number.

・ How to create an Adobe ID

https://helpx.adobe.com/manage-account/using/create-update-adobe-id.html#HowtocreateorupdateyourAdobeID

■ If the above procedure cannot be performed: Perform step 2.

Solution 2
Please delete the authentication information manually.

If you have Adobe products that are used in a version other than CS6, all of them will need to be recertified once with a serial number.

Please perform it with the serial number prepared beforehand.

1. Open the following folder.

・ 64-bit Windows:

C: \ Program Files (x86) \ Common Files \ Adobe \ SLCache

・ 32-bit Windows:

C: \ Program Files \ Common Files \ Adobe \ SLCache

・ Macintosh:

Macintosh HD / Library / Application Support / Adobe / SLCache

2. Please delete all the contents of the folder.

* Please do not delete the SLCache folder itself, only the contents.

3. Restart your PC once.

4. Start CS6 product and ask for login

Log in with a newly created AdobeID or an AdobeID that has never signed a Creative Cloud contract and authenticate with a serial number.

・ How to create an Adobe ID

https://helpx.adobe.com/manage-account/using/create-update-adobe-id.html#HowtocreateorupdateyourAdobeID

December 18, 2019 How to create an Adobe ID URL corrected to US version