In windows 10 you can search for files .
That being said , It is placed in folder "c:\Program Files (x86)\CRS\WWiionline
It was in "Battleground Europe" but it has been changed .
To run game you can also go to "start" button and then in the program list "cornered Rat Software" and run game from there .
To start game from inside that folder , just run "playgate.exe " or create a desktop icon running that file.
The installer should have created all that for you unless the installation was interupted somehow.
If you get prompted to use old files , delete or rename the folder "documents\Battleground Europe" as it is no longer used ,but the game will reference that folder for old cfml files as if you just updated from the pre 1.36 version.
I hope that was not too complicated .