I have built and packed this archive together for sadLeΛϟT93man. All credits go to him. :) So maybe his project will get more attention now, if it's uploaded...
Well Dyson, welcome to Black Mesa Reseach Station, feel like at new home. But don't forget your true way Dr. Poincare. I do believe you that you would come back in portal and all change the past, as was planned in advance. Well now, we must return to those times when it is not yet release of Half-Life. So begins a new сonversion modification "Unknown Half-Life". Time to choose... Is time to choose...
+ Own .WAD textures
+ Decals from Alpha.
+ Tentacle model of Alpha.
+ Glass Shard model (HACK) from Alpha.
+ Soundtrack of Alpha.
+ Button sounds menu of Alpha.
+ And some of the sounds from the Alpha.
+ Someone asked "Green HUD", filled in a experimental version: Unknown Half-Life: DLLs.
PS. To install .wad, it is necessary to go in "uhl1/_wad_install/" and run: _SETUP.bat