Exchange RU updates Failed – Exchange 2010

Symptoms:

Exchange RU are rolled back after start.
Following error visible in servicecontrol.log

System.Management.Automation.ParseException: At C:\Program Files\Microsoft\Exchange Server\V14\Scripts\ManageScheduledTask.ps1:462 char:5

+                 return $success

+                 ~~~~~~~~~~~~~~~

Control cannot leave a finally block.

at System.Management.Automation.Internal.PipelineProcessor.SynchronousExecuteEnumerate(Object input, Hashtable errorResults, Boolean enumerate)

at System.Management.Automation.PipelineOps.InvokePipeline(Object input, Boolean ignoreInput, CommandParameterInternal[][] pipeElements, CommandBaseAst[] pipeElementAsts, CommandRedirection[][] commandRedirections, FunctionContext funcContext)

at System.Management.Automation.Interpreter.ActionCallInstruction`6.Run(InterpretedFrame frame)

at System.Management.Automation.Interpreter.EnterTryCatchFinallyInstruction.Run(InterpretedFrame frame)

Cause:
Powershell 3.0 is isntalled and can not handle the instruction of the setup.

Solution:
Unistall: Windows Management Framework 3.0 – RC  KB2506143