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If it installs ok for you. While not "recommended" for the version & OS, sometimes it works.
I have FM11-15 on my laptop while I assist clients in various stages of upgrade. My older OS/system, had FM 6 - 10 for the same purpose. All legally purchased versions, of course. The limiting factor is if it will install ok.
As long as the install works, the main thing that you'll see is that the most recent install controls which version of teh App is used to open a file when you double click the file. To open it in an older version, you launch the older version first and then use Open from the file menu or the launcher screen to open the file with the desired version.
there would unlikely be such confusion between .fp7 and .fmp12 file formats, but a good tip, Phil