After getting the license info. I go to designated site and sign in as Academic_User, with password. For all of Rossetta releases, all I see are files with the .gz extension. Downloading these and using gunzip on linux, just gives a binary file-not even executable--Actually need source code anythow. What am I missing? I would have expected files with .tgz, for which I can get the source code (or , I guess the binaries plus source as bundle) to compile. I would like to try and use SnugDock, which I sense from other Forum responses, is only available with 2.3.1. But this issue with the .gz extension prevents me from even checking this. I've downloaded 3.3 a year ago--I think it was .tgz and have it compiled--but can't remember what the actual extension was at the download site at the time. Is SnugDock in version 3.7 somewhere ?