Trouble with ConfigMgr SP1 client

If you have had some issue with installing SP1 client on computer with the error message
Installation error 0x800b0101: System Center 2012 Configuration Manager Service Pack 1 client

Couldn’t verify ‘C:\WINDOWS\ccmsetup\MicrosoftPolicyPlatformSetup.msi’ authenticode signature. Return code 0x800b0101

There is now a hotfix available from Microsoft to download à