🚀 go-pugleaf

You will be able to use Adobe's free Reader 8 for many years to come. It's easy to have multiple versions on the same computer and use the old one only when you need to. On the Mac, you can right-click a file and then select Open With from the menu that appears and then select the older version in order to force the Mac to not open your document with the current version. I'm sure there's a way to do it on Windows.

Also on the Mac, you can select your old file and then File > Get Info and under the Open With menu, select the older version (Reader v8). That way, as long as the new version (Reader v9) is not already running, if you double click your file, it will launch Reader v8.

I don't know how to do this in Windows, but there may be a way.