Did you also tried the Rtest script?
Disallowed in the r.h header in the first place:
int Rstart(const char* source,int debug)
{
#ifdef _WIN64
quit("R not yet supported by Z64");
return 0;
#endif
if(hR) return hR; // R session already running
//......
}
Do we know when R will be supported in Z64?
No idea, but 64-bit R is supported by 32-bit Zorro.