[tinkerman]

I'm installing onto a Windows 7 x64 VM(virtual machine). ISTA-D(Rheingold) had been set up well (no problems). Then to make a separate VM for ISTA-P, I just made a copy of the ISTA-D VM, deleted the ISTA-D folder to save space (leaving all other system preparation installations intact), and proceeded with the ISTA-P install.

But when I ran the ISTA-P installer, I got the following ISTA/P Setup error:

"The installation prerequisites for ISTA/P are not met. Installation is not possible. Further information can be found in the ISPI Next Planning Guide."

What am I missing?

How much memory and free hard disk space are you allocating?

Minimum spec for memory is 2gb and free disk space 180GB if I remember correctly

The VM's memory is 2GB and free disk space is 182GB(of 250GB) on an external USB drive.
*The VM files are on an external USB drive, because the native computer (MacBook Air) drive is 'limited' to 256GB SSD while about 50GB reserved for Mac OS and another 50 or so GB used for Windows and other basic software.
** The computer's total memory of 4GB is being split 2GB/2GB for Host/Guest OS.