2013 Propper Fix for Half-Life 2: Episode Two

1. Download and extract this .zip into Steam\steamapps\name\

2. Open EP2 Hammer from Source SDK (NOT from Steam\steamapps\common) and go to Tools on the toolbar, then Options.
Under 'Game Data files' click Add and browse to propper.fgd (it should be immediately visible.) Click Apply close etc.

3. Go to 'Run Map', Advanced, and add a new configuration called Propper (or whatever.) The only Command will be running
the propper executable located in Steam\steamapps\name\sourcesdk\bin \source2009\bin\propper.exe
Under 'Parameters' type (or copy)
-game $gamedir $path\$file

4. Restart Hammer. Propper should now be functional.

Using Propper
Select your wannabe-prop brush and Tie to entity: propper_model. If you do not edit the directories, the compiled model
will be placed in Steam\steamapps\name\half-life 2: episode two\ep2\models, and its uncompiled source will be in C:\propsource.
When complete, run compile. The prop will not be solid unless you add clip brushes.

For additional help, visit the Propper page on Valve Developer Community.