Unable to validate serial number of acrobat Xi Pro.

[Mike in CA]

After completing installation process, I am unable to validate my serial number. System says that my acrobat version is too old. I purchased this full version in 2017. I did not install at that time, as I was happy with my earlier versions (with massively scalable thumbnail pages). Now Windows 10 has ended my past connections to those useful, earlier versions. Is there a workaround for validating my serial number and completing my install?

mike

[try67]

What do you mean by "System says that my acrobat version is too old"? That's not an error message I'm familiar with. Does it maybe say that you require a license of a previous full version? Post a screenshot or the exact text of the message you're getting.

[Mike in CA]

During the "serial number validation" screen at the end of the installation process, I select the validate button. The system responded with a statement that I am not connected to the internet (which was not the case). The system offers off-line methods for "temporary offline" and "permanently offline" methods, where request codes and response codes are created. I am unable to re-create the exact screen that referenced my "too old" version, but I am also not able to manually add the serial number in my account profile. When I try to manually register the program through my account I get "The provided serial number is invalid", where in the past it offered more information, that indicated that older versions could not be registered.