This article demonstrates how to load Arcade inside Reaper:
Open Reaper
Go into the tracks area, Right Click > Insert Virtual Instrument on New Track
Search for Arcade in the window that comes up
Click the VSTi, VSTi3, or AUi (Mac only) then click Add
Troubleshooting:
If you're unable to locate Arcade in Reaper, we recommend the following steps:
Open Reaper and go open the Preferences window found under the "Options" drop down tab
Go to Plug-Ins > VST on the side menu
Make sure that the following paths are in the "VST plug-in paths" list at the top of the menu
Windows:
C:\Program Files\Common Files\VST3
C:\Program Files\VstpluginsmacOS:
Macintosh HD/Library/Audio/Plug-Ins/Components/
Macintosh HD/Library/Audio/Plug-Ins/VST/
Macintosh HD/Library/Audio/Plug-Ins/VST3/
If these paths are not displayed, click Edit path list... and add the above locations.
Click Re-scan