You are the owner of that rulebas and you can request them to send you an export of the domain, you need to tell them the version that you need to go to, ie R80.30
What version are you on?
You can setup a VM-Ware R80.30 MDS and import the file they should send you, then you can either use that MDS (by default it is licensed for 2 weeks) to migrate to a SMS with the latest migration tools, however if you are already running a SMS you could also use the API to export the objects and rulebase.
Regards, Maarten