The CD's should work on Linux, they're just HTML files. It's all flash-based and runs off PDF's. It's the same as the Startek site.
ETM: https://www.startekinfo.com/StarTek/outside/12253/program/ETM_350SD.htm

We are discussing a W126 and not a W140 right? 1991 should be a W126, though the early 350SD W140s probably were produced in 1991. Just clarifying...

Yes, I live in the Hill Country. I live in the Kerrville/Ingram area.

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Current stable:
1995 E320 157K (Nancy)
1983 500SL 125K (SLoL)

Gone but not forgotten:
1986 300SDL (RIP)
1991 350SD
1991 560SEL
1990 560SEL
1986 500SEL Euro (Rusted to nothing at 47K!)

Gone and wanting to forget:
1985 524TD 167K (TotalDumpster™) [Definitely NOT a Benz]