Did a trial of Acrobat Reader DC

I decided I didn't need that version and so cancelled the trial.  I would like to reinstall my free Adobe Reader but can't find the download.  My pdf files that I used while doing the trial all require a password to get in (I didn't set up a password) and when I try another way to see my document, the formatting is all changed.  How can I reinstall my free adobe reader?

Thanks

alw