I don't know which update broke the site, but starting with the latest version at ThemeForest and updating from there, the site breaks with multiple errors.

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Hi,
Please go to your account page (http://megadrupal.com/user/ymmatt) to download an updated file of theme and check if it works.
I don't see anywhere to download a new theme.
Would I need to do a fresh install, with this file?
Sorry,
We just made a mistake. Because you are using latest version of theme so we would like to check again and reply ASAP.
Is this where I look?
Please check your account page again.
So do I delete my current install and re-install?
Yes, please delete your current one and reinstall the new one.
drush still shows quite a few updates:
and it always fails on the MD Slider update
Please update whole install profile.
again?