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I am attempting to combine files in Acrobat. I am on a Windows 10 Pro for Workstations v.22H2 OS build 19045.3803.
Acrobat would not open from the Start menu, so I opened an existing PDF in Acrobat to get the program running. It opened the DC version, and when I tried to coombine the files, I got an error saying I have a newer version of Acrobat on my machine. There is only the one version listed on my start menu, which is the Pro 64 version that wouldn't open. I tried opening the 64 bit version version using "Run as administrator" and it opened. I tried to combine the files again, and got the "unknown error" message with the little explanation marks on each file.
I went to my applications to repair Acrobat, and find the two versions installed Acrobat DC (2015) and Acrobat Pro 64 bit v22.003.20310. I tried uninstalling the 2015 version from my Windows Apps & Features page and get a "failed to reach server" message over and over again.
So, to combine my files I saved my pages as image files, created a Word doc, added each image to a page and saved as PDF in Word. That creates the PDF and it opens in the Acrobat DC version, but when I try to get page 2 and 3 to display simultaneously, I have no options to do so. I am also unable to sign in on the DC version.
Any help would be appreciated. Acrobat is an amazing tool when it works, but it sure seems to have issues all of the time.
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I ended up using the web version to combine my jpgs. It worked fine.
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That sounds more like you have a machine issue than an Acrobat issue. This is what I would try:
Uninstall Acrobat DC (I suppose, you have a subscription to that).
Reboot.
Uninstall Acrobat 2015 (I suppose it's the perpetual licence version).
Reboot.
Run AcroCleaner (AcroCleaner — Acrobat Desktop Tools and Utilities).
Download and install Acrobat DC 64 bits.
If at any time you run into uninstall problems, it is worth checking the Microsoft fora for a topic like that. This could be a good starting point: https://support.microsoft.com/en-us/topic/fix-problems-that-block-programs-from-being-installed-or-r...
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Thanks so much for these instructions. I followed them to the letter, and I still get the same error message in Acrobat when I try to combine the jpg files into a pdf.
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I ended up using the web version to combine my jpgs. It worked fine.

