Thanks for posting all this info!
Your link http://www.sevarg.net/images/2023-bw-tek/SpectrumStudioSetup.zip doesn’t appear to work anymore, the Science-Surplus.com site seems to still be down, and I didn’t have any luck finding the Spectrum Studio software at the Wayback Machine.
Any chance you could post the software (and ideally the alignment instructions pdf too) somewhere I can download it from?
Thanks…