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I have 2 PCs at work that suddenly are getting the trial window for Acobat XI thats counting down the days when they both have paid subscriptions. They have been working for years with no problem. We sign up with Creative Cloud. We can't lose this copy of Acrobat on one of the PCs because there are a couple of add-ons that we can't reinstall and only work with this version. I'm signed into Indesign and Illustrator just fine and with no problems. Soon as they turn on the computer and use Acrobat for the first time they get the window. I can't tell if they are logged in. Should be though since they aren't asking to login and when I follow the directions I can confirm I can reach the server.
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Acrobat XI is an old version, not compatible with any current OS and not supported by Adobe any longer.
It also has nothing to do with Creative Cloud. However, if you installed Acrobat DC (or even Reader DC!) that might cause a conflict with it. You would have to remove all such installations and then re-install Acrobat XI for it to (hopefully) work again. Good luck!
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Did you install Reader or the trial version of Acrobat DC, by any chance? I don't really have an answer why it stopped working, just that such things can happen when you run old software.
Anyway, reinstalling should not remove your add-ons, and you can always back them up before doing so, just in case.
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