How to optimize on graphics card? Another version of Cuda is already installed, do I still need to install the specified Cuda version? If yes, how do I do it?

To use the interface you don't need to install anything but start the solver als follows (for Windows: use a Powershell):

mscgd2019_CUDASolver 1234
The IP and port must be specified in the configuration file "FEM" (Standard "localhost" and "1234").
The solver can be used by several optimizations and doesn't have to be started again for following optimizations.
If the solver is not active, the error message "Cannot connect to Extern Solver, use CG solver" will appear in the Log file.