1.0 release for Ispitatel quaTrilogy | Remod, it already has all the necessary files to play Ispitatel so no other installations required. Installation instructions are in the description.
Installation is simple, simply extract the folders that is inside the .7z into your Half-Life installation folder (Where hl.exe is located, NOT inside any of the other folder such as "valve" or "valve_hd")"
Example would be "C:\Program Files\Steam\steamapps\common\Half-Life"
There should now be "ispitatel", "ispitatel2" and "ispitatel4_classic_english" inside you Half-Life installation folder along with any other
mod/steam-related folders you may have inside.
Restart Steam, all of the Ispitatel entries should be inside the Games list.
If that doesn't work somehow, create a shortcut of hl.exe, open it's Properties, add " -game MODNAME" to the end of the target bar.
Example would be "C:\Program Files\Steam\steamapps\common\Half-Life\hl.exe -game ispitatel"
The mod also adds simple detail texturing, if not activated yet, type "r_detailtextures 1" and its counterpart into the console.
Hope you enjoy!