When trying to upgrade Parallels Client for Windows by starting-up or clicking Check for updates now button, it fails because of the following error message:
The URL for Client Update has been changed.
Upgrade Parallels Client by either of the following ways:
Download a Client installer directly from https://www.parallels.com/products/ras/download/client/
In your client machine, change the value of the following registry key to https://download.parallels.com/ras/RASClient.xml
For v14.1 or older: HKEY_CURRENT_USER\Software\2X\AppServerClient\UpdateClientXMLURL For v15.0 or newer: HKEY_CURRENT_USER\Software\Parallels\AppServerClient\UpdateClientXMLURL
Create a client policy according to https://kb.parallels.com/123598, enable a checkbox in front of Options then make sure Update URL is set to https://download.parallels.com/ras/RASClient.xml