Symptom

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:

Cause

The URL for Client Update has been changed.

Workaround

Upgrade Parallels Client by either of the following ways:

1. Download a Client installer directly from https://www.parallels.com/products/ras/download/client/

2. 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
   

3. 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