Adobe Acrobat X Pro keeps asking for serial and login

Hello,

I've been having this issue for like few weeks out of sudden. I've decided to ask community for help because I'm totall at a loss, I have no idea what else I can do.

Here's list of the things I've tried:

1) acrofix (worked before when I had this problem)

2) adobe cleaner and then reinstallation of acrobat

3) deactivating licence via other apps and then reactivating it

4) deinstallation of whole Adobe CS6 Suite with adobe cleaner app, and then clearing registry

5) tried this steps: https://helpx.adobe.com/in/manage-account/kb/troubleshoot-creative-cloud-sign-out-sign-in.html

6) and this: https://helpx.adobe.com/in/download-install/kb/adobe-sign-in-loop.html#win_10

7) also this: https://community.adobe.com/t5/acrobat/acrobat-x-pro-won-t-start/td-p/9682007?page=1 

😎 and finally this: https://helpx.adobe.com/creative-suite/kb/acrobat-failed-launch-30-days.html 

Windows 10 v.1903

Adobe Creative Suite CS6 (it works just fine on my co-worker workstation - 2 computer licence)

As I mentioned above, problems started suddenly without any reason (no new installs, licences etc), at least to my knowledge.

If you have any idea what else I can try, I would be very grateful if you tell me.