Hi margarets4892885,
By "trying to download a PDF to word" do you mean that you are trying to export PDF to Word file?
If yes, please try once to sign in here: https://cloud.acrobat.com/ and check if you can export PDF.
Are you experiencing issue in signing in to Adobe Acrobat Reader DC?
Please make sure that you are using the correct Adobe ID.
Let us know if you are still experiencing the issue or need any help.
Regards,
Meenakshi