Finding Engine-Files after Windows reinstall

Hello,

sadly I had to reinstall Windows after systemcrash. Happylie I installed UE4 on an other harddrive. But now I want so tell the launcher, where to find the engine-files without downloading the whole stuff again (my internetconnection is only 6k)

Does someone know, where to change the path for the engines? The launcher sad, the Installation-path have to be empty, if I choose the old path.

MG