Serial number unknown
Hello.
I took over the job as Admin. I had to reinstall a PC and thereby reinstall Acrobat XI Pro also. When registering Adobe Acrobat XI he asks me for a previous version, since I only have a valid upgrade with Serial.
Unfortunately I can not find any information about a previous version and the products were not registered with Adobe.
Is there the possibility of Acrobat Pro XI to use or I have to buy a full Version?
Thanks a lot!