Just had to reinstall an user in Windows 10 2004 and Adobe Acrobat Reader DC 2020.009.20074 Same issue. Same fix did the trick. Don't forget at point 4, installing the fix, you must also apply the fix. It changes 32-bit AppID (Also, just the fix does not solve the issue. I had to go trough all the steps, to get the result.) p.s. Do you have additional software installed that is also capable to show PDF thumbnails? I have software (FastPictureViewer) to show thumbnails for many unsupported pictureformates (like PSD's) There I had to disable the create PDF thumbnail function. You can remove miniatures after point 4.
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