Acrobat X Pro installation error

Hello,

Today I tried to reinstall Acrobate X Pro from my old CS6 Master Collection.

In the end an error message popped up and when I clicked on "Support" it brought me to a webpage telling me that my license is fake. When I clicked on "find solutions" it brought me directly to a site to buy Adobe Creative Cloud plans.

I paid for this license a long time ago. It is offialy bought from Adobe directly and worked ever since.

Why is Adobe telling me that it’s "fake" and trying to force me to buy their new subscriptions?