Site Gone Down
Using Jamroom
next time you do the upgrade via the marketplace upgrade in this order:
* jrCore
* jrMarketplace
Then run the integrity check, then instead of using the UPDATE ALL ITEMS button, do them one at a time.
I suspect your server has gotten part way through and stopped.
you can also run the integrity check while not logged in to the ACP via this method:
Docs: "Somethings wrong what do I do: if you cannot get into the ACP"
https://www.jamroom.net/the-jamroom-network/documentation/troubleshooting/114/somethings-wrong-what-do-i-do#if-you-cannot-get-in-to-the-acp