I have just updated the OS of make mac to Sierra and have been advised that I need to update filemaker to 15. However it seems to be working without updating. Bit reluctant to upgrade unnecessarily as my use of the programme is fairly rudimentary. Having read the blurb the upgrade does not offer any improved features.
Thank you for your post!
You can definitely try to install and use FileMaker Pro 13 on MacOS Sierra, however it was not tested and you may have issues. The articles below might offer further information.