Note: RaQuest requires Enterprise Architect. You cannot use RaQuest without Enterprise Architect.

• Microsoft® Windows 10, Windows 8.1, Windows 8, Windows 7, Windows Vista, Windows 2008 Server, WIndows 2003 Server or Windows XP (SP2 or later). (32 bit and 64 bit operating systems supported*)
• Enterprise Architect 9.0 or later version (All editions supported)
  
  • Sparx Systems Keystore Service software version must be 1.3 or later version.

• RaQuest cannot be used with Linux or Mac.

*RaQuest is a 32 bit application, however it can be run on both 32-bit and 64-bit Windows Operating Systems.

Link:
Enterprise Architect's System Requirements