Make sure you have followed the instructions correctly and read the README before asking anything.

Notable changes

• multiplayer sort of works (untested);
• integrated mod launcher (only works with mods that don't require custom DLLs, this means CS and TFC won't work);
• sound pitch fixed;
• most blending bugs fixed;
• option to disable autosaves.

Important notes

• If you already had Release 1 installed with the full version of Half-Life before this, redo only step 2 from the list below.
• If you already had Release 1 installed with Half-Life Uplink, remove the whole xash3d folder and reinstall everything from scratch.

Installation guide

1. Copy the valve directory from your Half-Life installation (preferably the Steam version, but WON or stuff like Day One probably works as well) to ux0:/data/xash3d/ on your Vita. If you don't have access to a Half-Life installation, you can use the data files from the free demo version of HL, Half-Life Uplink. In that case, just extract this archive to ux0:/ on your Vita.
2. Extract data.zip to ux0:/ on your Vita. Replace everything if asked.
3. Install the VPK.
4. Run it. If you only have Uplink installed, make sure that you select Half-Life Uplink in the launcher.