First of all, I did not test if this bug exists in 3.0 because it needs a fresh install. Sorry if it is already solved, but I think it is not.
Problem After installation, the installer suggests to immediately run Simplify3D. However, if the installer was run with sudo (and it usually is) then the Simplify3D application is run as root but with the environment of the current user. This is a serious error. It creates the settings file in user directory but makes it read-only in future runs. This makes all settings in subsequent runs to be reverted to the state that they were on the first exit from the application. This happens to be silent and the user may even not know he has a problem, blaming developers for not saving settings at all.
Solution At the end of installation, Simplify3D application must run as the user who started sudo, not as root. Or, better yet, it should not be started at all, because you can not deduce proper user every time. There can be rather complicated cases. Running the software from the installer is a Window way and it does not fit easily into the Linux system, where applications run as sudo confer root rights to the apps they run and files they create. In Linux, the user should run the app for the first time, which by the way ensures that the user can run the app. Every app in Ubuntu repositories act this way.

Please help

I did not find the right solution from the internet.

Small Business Video Marketing Studio

Thank you