Select one of the 2 particle sets before you install, or optionally you could use Portal defaults.  Just remove the extra text and rename the folder to particles.

Refer to the included screenshots for the comparison.

TO INSTALL: drag the materials and particles folders into your respective Portal or Portal mod folder 

Steam\steamapps\USERNAMEHERE\portal\portal

or for mods

Steam\steamapps\sourcemods\PORTALMODNAME\


Please do not reupload without the permission of Hunterbrute, CabooseJr, Kave, and Omnicoder.


This pack includes:
1. Spiral portals
2. Gun sprites
3. 2 sets of particles


For the full mod please refer to

http://www.moddb.com/mods/portal-project-beta1