Well... I installed... v1.2.13 in one folder, then v1.4 in another, finally v1.5 in a third, making sure all those actually work (properly setting paths to the engine etc, choosing the proper gamepack). Finally as listed in the above post above "simply" unpacked v1.6.1 (GtkR-1.6-testbuildHipshot wrote:I still can't start this. I already had the MSVCR pack. But do I need to install it ower another radiant version? I don't really wanna over write my 1.4, so what of all versions do I need? I have 1.5, I rather not destroy that one, since I use it (rarely).
But I would love to test this 1.6 for my new level, I don't like cross mapping...

So if the gamepack was installed with v1.4, then v1.6.1 should already have all the necessary files, after an unzip... not requiring an actual installer. Alas I cannot re-test all this without deinstalling my working system.