Noticed that the link to the nightly builds was broken now fixed by creating a link on my server.

The nightly archive is created at midnight UK local time every night and hold current source of the ACAS system which may well include incomplete code and bugs in the sources.
For example payroll has had next to no testing other than to confirm the payroll parameter files are correctly created but there has been some changes to thepayroll parameter file over the last few days by adding more data fields and this 'can occur again' - ditto with some of the other file layouts as progrqamming continues.

You have been warned :)