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I had to do a clean install on my Mac.
I used FM Pro version 13. I have no reasons to go to a newer version, because of the limited use and my age.
Where do I find FM Pro 13?
Updates are all I can find. "No valid version found" is the comment I get when I try to install.
Assuming (1) you had FM13 already installed and (2) you have an up to date backup from before your clean install, you should be able to reinstall your previous version from your backup.
Retrieving data ...