None. Software may "support" it but there is no 64 bit driver for Spyder 4 so nothing will work. Forced obsolescence.
That isn’t forced obsolescence in any way. There’s nothing stopping you or anyone else from writing their own driver, just as Graeme Gill has done. I don’t and never have used a Datacolor device but a hardware company, quite obviously, won’t support an older device forever and if there is no business case to be made for it, why would you assume they should keep updating it when there is likely a very small user base still using such a device?
If you had made/designed some devices many years ago and were subsequently forced to write new drivers for every new OS released or every OS update, wouldn’t you expect to be paid for your time and effort? This is not forced obsolescence, it’s called normal business practices.