Welcome to the forum,

So you download the zip file,
unzip it to a dir on your pc,
open the .iso (or .mds) file with imgburn, (file, open)
insert a quality blank CD,
burn at x1 speed.

and this does not work? hmm...

Could be your PC cd/dvd burner is duff?

Or maybe the cd laser pickup is duff, you could try bunning the image to a dvd, that may work.

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Sept 03, M3, Silver Grey. Retro-fits: Modded Mk4 DVD Drive, OEM Bluetooth, VR Control, Rainbow Speaker Upgrade, Sony SOT Amp, HK Sub, CCFL, Intravee II, NightMode.