Had the same problem.
I’ve installed the newest version (3.3), and exported the file just fine. But I encountered a problem while restoring database during import, got stuck at 41% and nothing happened. Contacted support and got an older version of the plugin (3.2.2-48-gc3416e1). Installed it on both versions of the site, and both export and import worked perfectly.
Interesting thing that I noticed was that while importing, the newer version of the plugin export file had around 6000 files in a database for import, while the older one had just 3000 and something. Maybe it has something to do with the server upload limitations, not sure.
Anyway, I’ve uploaded the older version of the plugin at the following link.
https://www.sendspace.com/file/7bnxlc
If for some reason the link doesn’t work, contact the support and ask them to send you an older version.
Worked fine for me, maybe it will help someone.
Cheers