Hello @delchristie
Thank you for reaching out on the community and telling us about your issue. I do apologize for the issue you're having. It sounds like you should be able to get these files open with an intermediate version that will open files from previous times.
https://www.quicken.com/support/how-and-when-use-intermediate-version-convert-older-versions-quicken
In the article above it'll give you time frames of what program is able to open older versions of Quicken. By doing this you'll then be able to open some of your older files.
If you have any questions please let us know and we'll see what we can do!
Thanks,
Quicken Francisco
delchristie said: I have been using Quicken/Quickbooks for 20+ years and need to open some old files.