The installation disc contains the executable GROMA8-x, which automatically installs all the necessary files.
The installation program can be launched for example from the Start menu or using the program administrator called by the command Start->Launch and inserting its name for example
D:\GROMA8-0.
After the start, the program will ask you the name of the directory where you want to install the GROMA program (implicitly C:\GROMA8). The directory for the GROMA program doesn't have to exist yet - the installation program will create it.