For MBS Plugin the recent release 10.2 is updated for FileMaker 19. Older versions like 10.1 still had bugs we corrected later, so please avoid older plugins to not run into issues we fixed already. The older version 10.1 mostly works, but we have a few issues including a crash in Script Workspace. Using older versions in FileMaker 19 is not supported.
You may heard that Claris works on a Linux version of the FileMaker Server as mentioned in their roadmap video. MBS Plugin has been supporting Linux since we got the first Cloud server betas in 2016. Over the years we learnt a lot and currently our plugin works fine on a lot of FileMaker Cloud servers on AWS. Once released later this year, you may be able to install Claris FileMaker Server on your own computer running a supported Linux distribution. Our Linux version of MBS Plugin can be used there and we suggest you get the developer preview in the next months.
If you see problems, please do not hesitate to contact us.