Adobe Acrobat trial version installation suggeded somehow, but I cannot save a file I have changed from Word to PDF.

The installation of Acrobat trial version for 30 days seemed to succeed but after making a pdf file I could not save it into my own libraries on my computer. In the first case the system told that the trial time is over! How come? I had just installed it. Then I tried again, but now the system is requiring a "serial number". Then it said that I can find it there and there. I tried to log in there but it did not accept my password which I had just used. Ok. I changed the password and it was accepted by Adobe. But I never got any serial number anywhere. Then I tried to install Acrobat through another way. I have had Adobe Cloud and Premiere already for years. I tried to load Acrobat through there. I succeeded, but same problem again: "The trial time is 00 days". Then I also noticed that my old Adobe Reader has vanished somewhere. I could not open any pdf files I have received and opened before. I tried to re-install the Reader. No success because "the trial time is over" !!! What should I do? Maybe I can try to ask my friends to change the Word files into the pdf-versions but I need my Adobe Reader!