Hello fellas,
Quick Question. I accidentally removed Groove Agent and i’m guessing the only way to get it back is by re-installing Cubase.
Any chance of losing my plugins or messing up with my projects?
Thanks. 
Hi and welcome,
You are right, if you mean Groove Agent SE. Groove Agent SE installer and library is part of Cubase Full Installer.
No worries. The projects are completely Cubase installation independent, same as 3rd party plug-ins. Cubase build-in plug-ins could be updated by the installation, nothing more.
Thank you