Crash in mid-update SR1 to SR2 SDL Trados Studio 2019

Hello All,

I updated SR1 to SR2, but in the mid of the update (I guess after uninstalling the SR1, but before installing SR2 completely), my computer got disconnected from power.

I  tried to reinstall SR1 (downloaded from SDL site, file: SDLTradosStudio2019_SR1_44109.exe), but at the end of installation, it threw an error: 

Setup did not complete. The error is: Setup has detected a higher version of this product already installed. If you still wish to install this version, you must remove the other version first.

I believe this indicates that SR2 has already been installed. But I cannot find it anywhere.

What should I do?

Kind regards, Erich