I get this error when running the Admin Tools after installing Octopus.1.6.2…1722.
Could not load file or assembly system.core, version=2.0.5.0 …
OctopusError.pdf (6 KB)
Applying this update corrected my issue:
http://support.microsoft.com/kb/2468871/en-us
I found at this post:
http://help.octopusdeploy.com/discussions/problems/7327-upgrade-to-1601712-from-1511652-fails