For starters make sure that all half life games (episode 1, 2, half life 2 base game, and half life 2 update) are installed on the same drive.
I had the same issue of it not showing in my library, which I solved by using the answer on this page here: Bit.ly
You need to simply link the source mods folder on your "main drive," which is presumably your C: drive, to the source mods folder on your secondary drive.
If you're on Windows 10, this command will not work in Power Shell (the replacement for Command prompt), so you
will need to manually search and open up Command prompt instead.
To have the "command prompt" option show up when shift+right clicking as shown in the article I linked, you can follow this quick guide here: Bit.ly
Hope this works for you too!
Mccheesy22
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