I have a perpetual license of Framemaker 2017 and am looking to add a license. Is it possible to buy another 2017 seat? From what can see on the website I can only buy the latest (doesn't state the version).
If I can't buy 2017 then can I at least work on and save as FM2017 format on the latest version of the tool?
You can only save down one version from your current one as a FrameMaker binary (.fm) document. However, you can save to Maker Interchange Format (.mif) from any version and open it in any other version.
An alternative is my ConvertDocs script at frameexpert dot com.