I'm not 100% sure on which one of these will work for you, however i do know that when restoring the Insight database, it is upgraded to the latest format. Underneath it all, the backup is essentially an SQL Server database backup.
You could either try renaming the .zip file to a .ibu file (assuming they have just changed the extension to make it less likely for people to poke around in there), or they switched to no longer compressing the database backup.
In which case, open the zip file and see what it contains. For what it's worth, i know that Review and the "main" database are stored separately, so you may need to restore them separately.
Furthermore, i've heard that you need to upgrade these versions of Insight incrementally (i.e. 3 -> 4 -> 5), so you should probably call support to clarify.
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