There is newer version http://rtcw.pro/download/rtcw-hd-retexture-pack-v04-alpha-2/

Thanks for the link but I can't install it, I'm under windows 10, 64 bits and I use the GoG version.

I create the directory "retexture" and I place the file pk in this directory, in the game, in the main menu, I choose "retexture" as mod but in the game nothing changes.

Please help me.

Strange... It works for me. Did you set texture quality to high?

There is another way to use it:
1. simply place a zzzzzz_eugeny_hdpak0_alpha2.pk3 file in "Main" directory. (You can f
2. start a game. in the main menu go to options > system. set 'character textures' to 'extra' and set 'general textures' to 'high'. set 'texture filter' to 'trilinear'. also, you can set a 'video mode' for better resolution then "640x480". press 'apply' button.
3. You should see HD textures in game.

Thank you very much for your reply, your help has worked well, in fact I did not set the options in "system".

Everything is fine now. :)