what is "srep_new"?

[kj911]

The compressed size written above is only for the basic (Russian) language package? I found a release with version "1.2.0.43" after a quick search.
In addition to the Redist files, it contains these files:

setup.exe (4.09MB)
Data1a-01.slzn (just probably FreeArc or RAR/7-Zip archive.)

That's 12.8GB.

Plus, the files containing the "English" language: (the English files are created using patches with xdelta3, from the Russian language files, if I remember correctly.)

ENG_L.exe (InnoSetup)
ENG_L-1/2.bin (1.95GB+568MB)

The password for the "Setup.dll" in the installer is: selezen132

Filelist:

-dir-*XTool_2020
6,203*ARC_Optimal.ini
6,198*ARC_Standard.ini
716*CLS_Optimal.ini
693*CLS_Standard.ini
113*Records.ini
343,040*cls-lolz_x64.exe
318,464*CLS-SREP_NEW_x64.exe
188,416*CLS-SREP_NEW_x86.exe
2,965,504*XTool_2020\XTool.exe
1,029,632*CLS-DISKSPAN.dll
16,384*CLS-LOLZ.dll
17,408*CLS-SREP_NEW.dll
364,032*Facompress.dll
209,408*Facompress_MT.dll
535,552*XTool_2020\zlibwapi.dll
435,051*UninstallList.ini

Interestingly, MSC was not used, at least there is no sign of it. (There are references to AFR019 and MTX and XDelta3 deep in the installer's Pascal code.)
LOLZ is the same one that is available to anyone.