Adobe CS5 deaktivieren

You must contact Adobe Customer Support and ask the agent to reset your activation count.

https://helpx.adobe.com/contact.html

CS4, CS5 and CS6 are on life support. But they can still be activated providing you have the following:
1. original media (disks or downloads) you received at purchase,
2. a legitimate serial number for that particular version, language and platform (Win/Mac),
3. an older operating system that can support legacy 32-bit apps.
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NOTE 1 : Creative Suite installers won't work on macOS Sierra, High Sierra or Mojave without terminal workarounds.
https://helpx.adobe.com/creative-cloud/kb/install-creative-suite-mac-os-sierra.html

NOTE 2: Creative Suite cannot run on Catalina. Don't even try it. Either downgrade your OS or get new 64-bit software.

NOTE 3: Adobe removed the CS updaters. Your product may not work properly without the updates.

NOTE 4: Legacy Creative Suite is discontinued & unsupported. Use it at your own risk.

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Beware of fake Adobe reps who may contact you privately offering to sell you software or take control of your computer. It's a scam, run away!
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3 Easy Ways to Identify Genuine Adobe Staff
https://tinyurl.com/10791730

When you can't deactivate a serial number
BE SURE TO ONLY ASK FOR ACTIVATION SUPPORT TO ADJUST YOUR ACTIVATION COUNT
Click here https://helpx.adobe.com/contact/support.html

-click the chat icon at the bottom right of the page to open a chat session
-the chat icon looks like '3 dots inside a circle' at the lower right
-type AGENT into the chat window to connect directly to a person rather than the AI
Do be aware that Adobe's staffing is impacted by the virus, so wait times are long
.
Also: beware of answering anyone who sends you a private message
-click for more information about scammers https://tinyurl.com/10791730