Seriennummer deaktivieren

Adobe hat die Aktivierungsserver vor Längerem abgeschaltet. Acrobat XI ist damit nicht mehr neu aktivierbar, fürchte ich. 

Hello @MiBod14,

I hope you are doing well, and thank you for reaching out. We're sorry for the trouble you had.

Please note that Acrobat Pro 11 is an end-of-life and out-of-support product, whose support ended on October 15, 2017. To learn more, please check this article: https://adobe.ly/4tKBeEO

Adobe strongly recommends that you update to the latest versions of Adobe Acrobat and Adobe Acrobat Reader. By updating installations to the latest versions, you benefit from the latest functional enhancements and improved security measures.

There isn't much that can be done, as the troubleshooting steps may or may not work. You can try suggestions from this article: https://adobe.ly/4wLQKDs

I hope this helps.

Regards,

Anand Sri.