I have a license but the C: drive on my Windows 7 (Professional) PC was replaced. I still have the hard drive, but it's now Drive F: and I know I can't just copy the files from F:\Program Files\Adobe\FrameMaker6.0 to C:\Program Files.
If Adobe no longer provides download, you may need to go into the aftermarket and find someone selling legacy media. I see one on Amazon for US$50 for example. Most such "used' products are going to have spoiled or missing CD codes, but that shouldn't be a problem, if your license is a CD code.
Will it run?
What was your previous operating system?
I would be a bit surprised if FM6 runs native in Win7.
You might need to setup XP Mode.
Previous OS, Windows 7 Professional, same as before, and FM6 ran just fine on it. I don't think Adobe has a download for FM6; a support person told me to go to the forums. Specifically, "In this case I suggest you to refer Adobe Forums on the FrameMaker as it is a old Product and you get more information on this from there." Google search turns up Adobe FrameMaker 6.0 Download - FrameMaker.exe and
'Adobe FrameMaker: All versions - Software Informer. The first links to the second, and on the second I basically find out that it's not available. That is, it offers only a download of FM12. Actually, my search turned up that Amazon listing you cited. There the picture of the package reminded me that I had that very package buried away somewhere. I just had not used it in 10 years. Anyway, bottom line is I was able to install that version and it works fine. So, thanks.