!! Citrix PvD is a depcreated Feature and is replaced by Citrix AppLayering with Elastic Layers !!
If you installed the XenDesktop VDA the script ask you to run Personal vDisk Update on Client-OS (Windows 7,Windows 8.x and Windows 10) only.
The Script waits for the process CtxPvd to end and check the Pvdlog for successful result.