This doesn't help you but this past Xmas, when the Legacy collection was on sell for next to nothing, I bought it.

I run PTPA 2013 in Win 7 (64) and installed the Korg collection in the default location (but will be moving it )

C:\Program Files (X86)\Korg\Korg Legacy\...

And all the Korg plug-ins work for me (M1, Wavestation, MonoPoly,..) - no issues here with MME, ASIO (in this case, my M-Audio FW 410 ASIO drivers) and ALSO ASIO4ALL. MY MoBO has a Realtek chipset.

I normally run ALL VSTis from my physical D drive. I just haven't gotten around to moving Korg off C drive yet. I Usually test if I like them first, if not I don't hassle with the moving to my D drive I simply delete them. Since in SOME cases moving VSTi's require a little extra work to fully and completely divorce them from the C drive.

In case of Korg stuff I like the M1 (and Wavestation) again just haven't moved them off my C drive yet.

Let me know if there is I can help with trouble shooting
Good Luck
Larry

Win10Pro,i9,64GB,2TBSSD+20TBHDDs,1080TI,BIAB'24,Scarlett18i8,Montage7,Fusion 8HD,QS8,Integra7,XV5080,QSR,SC-8850,SPLAT,FL21&others,Komp.14,IK suite&others, just a guitar player-AXE FX III &FM9T, FishmanTP, MIDIGuitar2, GK2/3'sw/GI20