Have you tried the link to Acer's driver site that can be found here at this site?
The Acer UK site, sometimes has different things posted - can't find the URL at the moment.
Also the Vide-cdd.sys file that ships with newer Acer CD units seems to work fine for some of their older drives - I can't swear that it will work for all, though. However, the driver for my 40x works for my old 8x. So if you can't find the exact driver for your model, try the Vide-cdd.sys file. You should be able to find this at any Acer site.
You can find that driver right here at this site. Try this driver, I've used it for about a year now and it has worked on every IDE CD-ROM drive that I've tried it on:
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