PowerLog v4.0.38 Client and Capture have been upgraded to Full Release are available now from the PowerLog v4 Support Pages - http://support.psquared.net/products/powerlog/v4.0/ The main reason for this version is Windows 7 Support.
To request access to evaluate this version (if you don't have it already) you will need to contact your sales account manager (either give them a call on 01482 350700 or email sales@psquared.net) and they will be able to sort you out with the username and password as well as license details.