TC 7.1.3 -> 8.1.4 agent upgrade failure

Hi, I can't get the Windows Server 2012 TC Agent 7.1.3 -> 8.1.4 to upgrade properly:

http://localhost:80/update/plugins/xcode-runner.zip ==> C:\TeamCity\buildAgent\update\plugins\xcode-runner.zip 
[2014-08-08 14:14:26,818]   INFO -    jetbrains.buildServer.AGENT - Downloading http://localhost:80/update/plugins/xml-report-plugin.zip ==> C:\TeamCity\buildAgent\update\plugins\xml-report-plugin.zip 
[2014-08-08 14:14:26,849]   INFO -    jetbrains.buildServer.AGENT - Downloading http://localhost:80/update/buildAgent.zip ==> C:\TeamCity\buildAgent\update\buildAgent.zip 
[2014-08-08 14:14:29,377]   INFO -    jetbrains.buildServer.AGENT - Upgrade mode: jetbrains.buildServer.agent.impl.upgrade.modes.FullUpgradeMode 
[2014-08-08 14:14:29,392]   INFO - rocesses.ProcessTreeTerminator - Using jetbrains.buildServer.processes.ProcessTreeTerminatorWindows 
[2014-08-08 14:14:29,985]   INFO - processes.VisitableProcessTree - Visited process: PID: 2168 PPID: 2152 CMD: conhost.exe 
[2014-08-08 14:14:29,985]   INFO - .ProcessTreeTerminatorImplBase - Kill process pid=2168 cmd=conhost.exe 
[2014-08-08 14:14:30,001]   INFO -    jetbrains.buildServer.AGENT - Exit for upgrade 
[2014-08-08 14:14:30,001]   INFO - ent.impl.upgrade.AgentExitCode - Agent exited. Upgrade process 
[2014-08-08 14:14:30,016]   INFO - buildServer.agent.AgentMain2$2 - Closing jetbrains.buildServer.agent.AgentMain2$2@fe6b32: startup date [Fri Aug 08 14:10:29 UTC 2014]; root of context hierarchy 

Gets stuck after that in a disconnected state.

Please help! I've tried rebooting, there's no such process running anymore (with those PIDs) and I've tried restarting the agent.