Powershell snap-ins remain in  7.15 LTSR CU3 after PVS server is upgraded to 7.15 LTSR CU4.

Workaround:- 

1. Mount the PVS 7.15 LTSR CU4 iso
2. Open the iso mounted and go to folder: Console > ISSetupPrerequisites.
3. You will see a list of Powershell snap-ins. Click on each of them and install one by one
- DelegatedAdmin_PowershellSnapin-x64
- ConfigurationLogging_PowershellSnapin_x64
- Host_PowershellSnapIn_x64
- Configuration_PowerShellSnapIn_x64

4. Now go to folder: Server > ISSetupPrerequisites.
5. You will again see a list of Powershell snap-ins. Click and install the following:-              --Broker_PowershellSnapin_x64

6. Go to Programs and features and check: The snap-ins will be upgraded to CU4

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Problem Cause

This is a reported bug with Citrix under the Bug ID: LCM-6238