You don't need Acrobat to read PDFs, as Acrobat is a PDF authoring tool. You need Adobe Reader. You can download it from Adobe's site: https://get.adobe.com/uk/reader/
I have met here a thread about free programs that you can use. Try to search it there. Besides, torrents (if you use them, do it, if not — start doing it))) will help. Simply delete your old Adobe, download the new one (with the key) and install it.
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