The longs paths are indeed a limitation when running the VSIX installations in Windows XP.
Did you by any chance have the previous Telerik WPF VSExtensions installed by the installer, but not through the VS Online Gallery?
Here are the steps to install them the way the installer does (administrative install, i.e. add them under the Visual Studio install dir):
- Download the VSExtensions to a local folder
- Run a Visual Studio 2010 Command Prompt
- Navigate to the folder with the VSExtensions package
- run the following command:
vsixinstaller.exe /a Telerik.WPF.VSPackage.vsix
Let me know if that helps.
the Telerik team
Do you want to have your say when we set our development plans?
Do you want to know when a feature you care about is added or when a bug fixed?
Telerik Public Issue Tracking
system and vote to affect the priority of the items