Hello Sarah Letza
Just to put your mind at rest- reinstalling MultiTerm will not affect your Termbase as these are stored in a separate folder.
However, you should always backup your resources on a regular basis just to be on the safe side-
The following free app- appstore.sdl.com/.../
simplifies and automates this process for you.
Next i would first open Studio 2019 and check for updates (help tab) and ensure this is up to date.
Then as i think MultiTerm has simply not installed the components correctly- please navigate the following modules and perform manual install (double-click to start each module)
MTConvert15.msi (SDL MultiTerm Convert)
MTCore15.msi(SDL MultiTerm Core Components)
MTStudio15.msi (SDL MultiTerm Desktop)
MTWidget15.msi (SDL MultiTerm Widget)
Please note that you should be logged on as ADMIN to perform most install/update tasks.