Unfortunately it's in german so guess I should recap the steps.
1. Start as administrator. That didn't help.
2. Use compatibility mode. The guide recommends Windows 8. If that doesn't work Windows 7. And if that doesn't work either it recommends the compatibility troubleshooter. That didn't help.
3. Killing background processes. That didn't help.
4. Disabeling protected mode through the registry editor. That didn't help.
Now what's really weird is, as I read in some other guide, that the file path of my installation was wrong/different. It was something like C:\Program Files\Adobe\Acrobat\...
Now it's C:\Program Files (x86)\Adobe\Acrobat Reader DC\... I don't know if that's important but it seemed weird to me. Like Windows couldn't find the installation or whatever.
Reinstalling Adobe Reader the more obvious way through Microsoft Store or the official Adobe Website didn't work. Both ways it seemed fine but Adobe always crashed.
Maybe someone finds out what caused the crash. If so a reply would be nice. I hope those workarounds will stay and those fancy GUIs won't destroy the experience. Cause I'm not a friend of them. Anyway, I'm glad Adobe Reader is working again. Cheers everyone.
I think you can mark this as solved as I was able to fix the issue by myself. Although I'm not sure what caused the crash.
My solution was given in this link: https://tonv.online/so-beheben-sie-das-problem-mit-dem-nicht-offnenden-adobe-acrobat-reader-dc-in-wi...
Unfortunately it's in german so guess I should recap the steps.
1. Start as administrator. That didn't help.
2. Use compatibility mode. The guide recommends Windows 8. If that doesn't work Windows 7. And if that doesn't work either it recommends the compatibility troubleshooter. That didn't help.
3. Killing background processes. That didn't help.
4. Disabeling protected mode through the registry editor. That didn't help.
5. Updating Windows. That didn't help.
6. Erase and reinstall Acrobat Reader using Adobe Reader and Acrobat Cleaner Tool through this link: https://www.adobe.com/devnet-docs/acrobatetk/tools/Labs/cleaner.html as the link in th guide is not working. I ran the Cleaner. Restarted my PC. Got Acrobat Reader through this link: https://get.adobe.com/de/reader/enterprise/ . And that my friends is what solved it!
Now what's really weird is, as I read in some other guide, that the file path of my installation was wrong/different. It was something like C:\Program Files\Adobe\Acrobat\...
Now it's C:\Program Files (x86)\Adobe\Acrobat Reader DC\... I don't know if that's important but it seemed weird to me. Like Windows couldn't find the installation or whatever.
Reinstalling Adobe Reader the more obvious way through Microsoft Store or the official Adobe Website didn't work. Both ways it seemed fine but Adobe always crashed.
Maybe someone finds out what caused the crash. If so a reply would be nice. I hope those workarounds will stay and those fancy GUIs won't destroy the experience. Cause I'm not a friend of them. Anyway, I'm glad Adobe Reader is working again. Cheers everyone.