Acrobat Reader DC has froze running package scripts

I upgraded to Catalina. Today, I downloaded Adobe Acrobat Reader DC after the "update needed" windows appeared on my monitor. I went to the Adobe website and downloaded Adobe AcroRdrDC_2001220048_MUI. I left the computer to download while I did something else, and when I came back the progress window appeared to be frozen. The progress window wouldn't respond. I saw no progress in the download. This is now a couple hours after I started the process. I thought I should try turning off the computer, which tends to resolve other problems I've had with Catalina, but I got a progress window saying "your computer can't be shut down now, because software is being installed. AcroRdrDC_2001220048_MUI is being installed. Interrupting the install may damage your computer. You can shut down when the install is complete." The progress bar shows about 2/3 of the task of "running package scripts" is done. I went to bed to let it work overnight--we are now about 6 hours into this install--and this morning there's been absolutely no progress. It seems I can use the rest of my computer (I opened Chrome to contact this community) but I won't be able to shut down or use Adobe Reader... Can anyone help?