I am a recent Pulsar 2 owner after having lusted after a Scope system since I first heard about them back in 1999. I have managed to get it functioning inside a Quicksilver G4 alongside a Korg Oasys PCI, which I can already see will be an insanely capable and distinct sonic pallet.
This is then connected to the main DAW, a Haswell i7-4790 3.6Ghz running RME HDSP and Ableton on W7x64, via the optical I/O. Word clock via BNC syncs the signal on the RME and the Oasys to the digital card of an ISA428, whist the Pulsar collects the sync signal via ADAT.
I've only just got this up and running, having never used Mac OS9 before. The Oasys used to live in a customised XPC Shuttle case, but it always seemed like not-quite-the-finished-article, due to the DSP programming application (SynthKit) being OS9 only. Similar to Creamware, Korg chose to not develop OSX or XP drivers for their cards, creating a strange situation where we have these bizarrely powerful DSP cards frozen and bound to technology from the last millenium. As such, it always seemed to make the most sense to get this inside an OS9 box.
Even with the mega-frustrating OMS.
At some point, probably when I can afford a Korg Oasys keyboard and a Nord Modular G2 at the same time, I could be convinced to relinquish OS9, but for now, I happy with my dinosaur DSPasaurus.
However, the version of the install I have for my card is v2.02. I understand the latest verson that worked on OS9 was around 4.X, which I downloaded from the Sonic Core archive when initially trying to get the card running.
Here I hit a brick wall. I was suddenly presented with a demand for serial numbers for all these devices, when all I had was a one week old, 2nd hand Pulsar 2 with a legible but faded serial number on a tatty old manual. I certainly didn't have anything that resembled the serial numbers being demanded, and I went back to the included v2.02 install disc, which eventually worked.
And wow... What a fantastic sounding and flexible little card! Having it connected to the Oasys via lightpipe in the same machine is a dream I do not want to wake up from just yet!

So, this introduction is a way of asking any one who might know what I can do re: my licensing on this old machine.
SFPv5.1 is discounted until this evening. I have the funds ready to buy it, but I don't actually want v5.1 - I want to be able to run the latest most stable version of the Scope software on Mac OS9. I have emailed Sonic Core with this question, but I suspect I will not hear from them until after the upgrade offer expires.
Does anyone know if buying the 5.1 upgrade would allow me to use 4.x?
Does anyone have a copy of the last version 2 (v2.04 IIRC? :-s) Or v3.1 for that matter?
Does anyone else still run this gloriously spectacular card on OS9?
Thank you for reading and for such a great little forum.
(which I did search previous to posting this, but all my keywords are too short.)

Wishing everyone a very prosperous 2016!