Have a look here, load of manuals to download:
http://193.219.82.238/~manual/Workshop%20manual's/
or if you want the iso of the disc people are selling on Ebay then download it here rather than paying for it:
http://roel.net/156/alfa156cd.iso
The only trouble with the iso link is it doesn't always work, took me about 2 days clicking(not constantly obviously) but if eventually worked.