Comp G is available as AudioUnit, VST, VST3, AAX32 (ProTools 10.3.5 and above), AAX64 (ProTools 11 and 12) plugins, as well as a standalone application.
Both 32bit and 64bit are natively supported.
You can authorize Comp G on up to three computers that you own and one USB stick with a simple one-click software procedure (no hardware key needed).