Uniphy Platform Designer Error: "Cannot find sequencer/sequencer.elf"

I think I have a similar problem:

Platform Designer cannot find nios2eds commands

Installed Q21.1.0.842 on Win10 19042.1466, with Ubuntu 18.8.4

(problem observed with Q19 & Q20 as well on two Win10 machines)

PlatformDesigner generate CycloneV project

>ERROR
Info: p0: "fmem" instantiated altera_mem_if_lpddr2_hard_phy_core "p0"
Error: s0: Error during execution of "{C:/programs/altera/21.1/quartus/../nios2eds/Nios II Command Shell.bat}
make all 2>> stderr.txt": child process exited abnormally
Error: s0: Execution of command "{C:/programs/altera/21.1/quartus/../nios2eds/Nios II Command Shell.bat}
make all 2>> stderr.txt" failed

what I see is that

Quartus expects /../nios2eds/Nios II Command Shell.bat to be in /altera/21.1/quartus/
but
Quartus installation put the nios2eds/Nios II Command Shell.bat in /altera/21.1/
and fwiw,
Quartus installed the make.exe file in altera/21.1/nios2eds/bin/gnu/H-x86_64-mingw32/bin/
It seems that an environment variable is wrong.

I'm still using Q18 and waiting for the intel paint to dry.

-john