XF 2.2 Xenforo CLI update throws error, web browser update hangs

I run
Code:
php cmd.php xf:upgrade

and I get this output:

Code:
Current version: 2011270
Upgrade target: 2020671 (2.2.6 Patch 1)
Are you sure you want to continue with the upgrade? [y/n] y


In Upgrade.php line 119:

  Call to undefined method XF\Install\Upgrader::assertValidUpgradeSteps()


 In Upgrade.php line 119:

  Call to undefined method XF\Install\Upgrader::assertValidUpgradeSteps()

xf:upgrade [--skip-statistics]

I tried a manual update because the web updater hangs and eventually 5xxs. -- Now even trying to login at /install/ does the same

How do I fix this?
 
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