Hi Chucky, you should have the basic TvsT game then install the Kursk foundation Alpha release see past posts (mods existing missions). There is an optional Mission 3 post this phase but I skipped it after trying (not cause it was bad - just to keep the testing simple for me).
Then install the Kursk mission either v.4 or v.5.
v.4 has lots of units and activity hence the FPS issue (at present) on a lot of PCs. v.5 is a 'lighter' cut down version more suitable for higher framerates. Hope I got that right for you and it makes sense.
Frinic and Lc hello will reply to your posts later no time at present!
All the best - Mort