It's easy; just download this Collection:
https://steamproxy.net/sharedfiles/filedetails/?id=2857107016
Black Mesa: FIXED is a Collection I have put together in order to fix the large majority of issues I have with the game. On top of adding some general improvements, Black Mesa: FIXED fixes a lot of issues with the game like graphical bugs and lore-inaccurate textures, and adds back things that Crowbar Collective REALLY should not have changed while adapting the original game for a modern audience (see full list of changes below).

I have personally gone through and confirmed that all of these addons (except one) work WITHOUT having to do any annoying custom installation and are 100% compatible with each other. Just click "Subscribe to all" and you're (mostly) good to go! :D

The only addon you need to custom install is "Classic Bullsquid" https://steamproxy.net/sharedfiles/filedetails/?id=1526473396 Just put "Classic Bullsquid.vpk" (found at C:\Program Files (x86)\Steam\steamapps\workshop\content\362890\1526473396) in your Custom folder.
Guide on how to setup a Custom can be found here: https://steamproxy.net/sharedfiles/filedetails/?id=502670746)
- Weapon particle effects
- Weapon viewmodel blood
- The first-person HEV suit model
- Health and HEV Suit Chargers (more detailed and true to the original designs)
- Kleiner and Eli's character models (fixes labcoat clipping bug)
- Headcrab model
- Bullsquid model
- Ichthyosaur model
- Alien Grunt model
- Alien Tentacle model
- Alien Controller model
- Gonarch model
- G-Man model
- Human and Alien blood textures
- Bullsquid Spit texture
- Concrete texture
- Wall Poster textures
- Newspaper texture (makes it actually lore accurate)
- Vending Machine textures (more true to the original designs)
- Flare texture (makes it so just the text glows instead of the whole flare glowing which looks weird)
- Makes Voritgaunt Murals glow like they do in Half-Life: Alyx (more lore accurate)
- Improves Gordon's Locker in "Anomalous Materials"
- Fixes the landscape pop-in bug in "Interloper"

- Changes the soundtrack back to the original by Kelly Bailey which is at least 5x better than what Crowbar Collective gave us (fits the mood/atmosphere of the levels sooo much better)
- Weapon sounds (much better, meatier punch)
- Reverts Health and HEV Suit Charger sounds back to the original Half-Life versions
- Reverts the intercom voice to the original Half-Life version so it's not super cringe (seriously, why did Crowbar Collective make it sound so bad? My first playthrough was with no addons and I was cringing the entire time at how edgy it is trying to be)
- Makes the Thunderclap Radio Conversation lore accurate by adding background sound effects
- Changes the G-Man voice back to the original ("End Game" speech sounds so much better/creepier)
- Many other miscellaneous sound improvements/changes

This Collection also adds back in back in the "Hazard Course" tutorial map which is missing by default and "Further Data" which is a remastered version of Half-Life: Uplink (the demo for the original Half-Life). Of course if you do not want these maps you can simply unsubscribe from them.