Included with Guitar Rig 5 should be a CD. Insert the CD into your computer, and run the installer. After the Guitar Rig 5 installer has completed, follow these steps to add Guitar Rig 5 to Reaper.
- In Reaper, select Options > Preferences
- In the Preferences dialog box, select VST
- Select Auto-Detect
Auto-Detect should locate C:\Program Files\Native Instruments\VSTPlugins 32 bit.