It's been a while since this mod has seen updates... but it's never too late. Here's what they said at Wolfenstein files:

After a very very very long time ( almost 2 years )ET has some very severe and not so severe holes patched up, the ETPro Mod guys have worked in conjunction with splash damage and have brought it up to v2.60 yes its a big jump from v1.02 but actually its just a numbering convention change. The v1.02 was actually v2.56.

Grab the file.