The only way to get older updates is to have archived them while they were available. We only provide the latest version and only via Impulse/Impulse anywhere.
Why???
I choose the disc rather than download because my gaming computer is NOT on line. It never was a problem before, I just went to the site, put the patch on the flash drive or in the ancient days a floppy and copied it to the gaming computer.
Now iI have a Coaster with version 1.00 on it. and no way I can figure to get the correct files to the gaming computer. I tried putting the game on the laptop and then transferring the patch files over to the other. Doesn't work, don't know why.
You guys were alays differnent than Steam. Now you are getting ready to walk the same path. 
