Someone asked support this week :

Hello,

I need to know what's the command to do a silent install of Beyond 20/20 ver. 7.0.3050? \setup.exe /L 1036 /S didn't work.

The answer is:

Set your working directory to where the setup.exe, MSI and MST files are.
The full path to the MSI will not be required, but the full path is required for the TRANSFORMS parameter.

This command line should work.

msiexec /i "Beyond 2020 Professional Browser 7.0 SP3.msi" TRANSFORMS="C:\%fullpath%\1036.mst" /qn

To remove the application, use /x instead of /i like this :
msiexec /x "Beyond 2020 Professional Browser 7.0 SP3.msi"

By the way, this was for a french installation (1036).
For an English installation, use 1033, instead of 1036, and for a Spanish installation, use 1034.