Cool :) Thx

It will! My mod is build upon TSLRCM, so it includes all its changes :)

Done :)
Will TSLRCM be working as usual?

Figures. So, to get my mod working you have to:
1. Go to ...Steam\steamapps\workshop\content\208580\3513599212\Override and copy "visasmarr.dlg" file
2. Then, paste it into the folder depanding on your TSLRCM+M4-78 mod language:
English Version: ...Steam\steamapps\workshop\content\208580\1402798020\Override
Russian Version: ...Steam\steamapps\workshop\content\208580\2143268293\Override
(Make sure to agree to replace the existing file)

I'm pretty sure it'll work after that.

Eww. Yep. I have Steam version of TSLRCM+M4-78

A new save for this mod is unnecessary, it can be installed and uninstalled at any point (though it's still good practice for other mods!).
Everything seems to be in order, so I'm sure you have a mod conflict. Anything that alters Visas' dialogue will likely override my changes.
If you installed TSLRCM through the Steam Workshop, that will definitely cause a conflict, as the Workshop version overrides every other mod by default.
Tell me if that’s the case, or what other mods you have and I’ll see what I can do.

Something is wrong: dialogue option doesn't appear.
Alignment is 93, influence is 100, Exile is 19 lvl and is a Weapon master, Visas is 16 lvl, I am aboard Hawk, but it doesn't work. And of course I started new game after subscribing.

I never used it myself, so I can't say for sure, but a quick search on deadlystream shows that they might have a conflicting script (it duplicates Bao-Dur during his training). Maybe there is something else, maybe not.
The mod is 20 years old, which predates first release of TSLRCM by a few years. I can’t test it myself right now, but you might find more details in older forum threads.

Do you know if SS Prestige Padawans is compatible with TSLRCM?

I won't, because the game engine doesn't support adding a third class to characters. But there’s already a mod that lets you train companions in prestige classes instead of basic Jedi ones.
Check it out: SS Prestige Padawans [www.gamefront.com]

Will you be adding this for the rest of the companions as well?