Problems moving a sub-site from one multisite to another

Hi there,

I want to move a number of sub-sites on a multisite install (JustThinkBiG.co) to another multisite install (ThinkBiGSites.co.uk) and intend to use Snapshot pro to do so. I've followed the instructions on one of your blog posts; https://premium.wpmudev.org/blog/easy-migration-snapshot/ but am getting the following error when I try to import the Snapshot from Dropbox;

"Error: Manifest data not found in archive.
Snapshot import complete"

I've double-checked the instructions in the blog post and it looks like I've used the correct settings for the Snapshot but, clearly, I'm missing something.

Your help on this would be appreciated, as I have a number of sites i want to move over and it's going to be a challenge if I can't crack this.

Kindest regards

Steve