I have the same Problem at step 6 with Netsted Migrator and the error message tells me that Version 0.8 ist not compatible
XWiki: 15.10
Confluence Migrator Apllication 1.1
Nested Pages Migrator Apllication: 0.7
Nested Pages Migrator API: 0.7
The Nested Pages Extensions where first installed as dependency with version 0.7.6.
After the error i downgraded both Extensions to version 0.7 but the error still exists.
Can Someone tell me how to fix this or do i have to clear something. I already cleared the browser cache.
Thank you for your help.