Block Adobe Acrobat versions which are EOL
Adobe Acrobat 8 is available to blacklist. Update the option to allow blocking EOL versions of Adobe Acrobat & Acrobat Pro. Today, version 11 or earlier is end of life.
Claire Bellmonte commented
I think you will do not give the genuine product key of Adobe Acrobat 8 and Adobe Acrobat Pro. If you have downloaded the latest version of the software must to product key. If you insert key on the software definitely will be solved your problem.
If any doubt about the Adobe Software you have another option just follow on this link https://www.adobesupportphonenumber.com/ and ask your solution.