Errors after upgrade to 9.1

Hi

I’m now running 9.1
I was running 2.8.4 prior to the upgrade
Unfortunatley I did not save my database before upgrading (doh)

I have been using the theme vslider 3.2 with WPG2 embedded into wordpress and running Gallery 2.3

expeditions.verticalresources.org

After the upgrade I find
the theme is broken (so changed themes but still have the following issues below)
unable to naviagte to any of my pages.
WPG2 is broken.
I am unable to enter my gallery albumns in standalone or embedded versions.
I am unable to enter my gallery site admin.

I know this is pretty vague but any advice appreciated