BEWARE THOSE SPAMMERS WITH FILE RECOVERY APPS. We delete those as spam now.
PS. Adding with edit. You tried InDesign so your next stop is Adobe support. Start at adobe.com
More: https://www.ebay.com/p/Adobe-PageMaker-Plus-6-5/127527091 finds this old app for sale from 20 to more dollars. If you feel you need to go back to the old version, this is how folk do this today. Get the CD and key from ebay and maybe an old PC to do the work on.