Access to older version

Hi. We have just picked up the support of a website, based on an old version of Boldial (1.8). I could not get the purchase information from the previous maintenance team, so I purchased a new account just to be sure the license is covered.
Unfortunately the previous support team edited the theme directly. We would like to separate the changes they made in a child theme so that the Boldial theme would remain upgradeable. To do this, we need to run a diff against the 1.8 release.
Would it be possible to provide us with access to this release? Your help is greatly appreciated!
Yavor