I found a solution.
I downgraded the wordpress installation to 4.2, then repeated the steps above and it worked. I can now upgrade the wp installation to the latest version and everything is good.
Having the very same problem. At restoring website the plugin gets stuck at 39%. This is my second time around trying to restore the site via this plugin.
The first time it also stuck at 39%, thinking the visuals were just glitched I closed the browser and tried to log in but all I got was a blank page, no installation page or anything so something is definently quirky.
The upload file was about 250 MB and I uploaded it via my dropbox account.
Any help would be greatly apreciated.