You could potentially create a VM of an older version of OS X and use that to run the older version of FileMaker.

Update: Now found a single document which seems to summarise all the versions, despite what this says and FileMaker do admit this, often you can run newer versions of OS X than the following list but it is at your own risk. In reality you might well get away with a much older version, to some extent it will depend on what functions you use and how paranoid you are over possible subtle problems happening which might affect you. So, overall it seems the earliest fully Sierra compatible version would be 15.0.3 as stated by FileMaker themselves. What that article does not make clear is that there is now a 15.0.3 update which may resolve those issues. Which says that FileMaker 15 works on Sierra with a handful of issues as per that document at least with regards to 15.0.2 and 15.0.1. Which basically says that FileMaker have not tested version 14 and earlier on Sierra and are not going to and therefore will not say if it does or does not work. er-versions%2C-macos-sierra-compatibilit… r-filemaker-pro-16-and-filemaker-pro-16-… r-filemaker-pro-15-and-filemaker-pro-15-… r-filemaker-pro-14-and-filemaker-pro-14-… r-filemaker-pro-13-and-filemaker-pro-13-… r-filemaker-pro-12-and-filemaker-pro-12-… filemaker-pro-11-and-filemaker-pro-11-a… I did find the following which does not really answer this. Like I believe what others have found and stated FileMaker's website is not clear one whether specific older versions are compatible with newer versions of OS X.

FileMaker 9, 10 and 11 all use the same file format, FileMaker 12, 13, 14, 15 and 16 use the new format.

Filemaker pro 11 app