The Installation Package Could Not Be Opened Error Occurs
|Progress® Telerik® UI for ASP.NET AJAX
When installing Telerik UI or ASP.NET AJAX, an error that the installation package cannot be opened and that I have to contact the application vendor to verify the Windows installer package is valid occurs.
This installation package could not be opened. Contact the Application vendor to verify that this is a valid windows installer package
The possible reasons for this issue may be the following:
The installation file got corrupt during the download.
The installation file was downloaded to a compressed folder and/or the
Tempfolder on the machine is compressed.
To solve this issue:
Log in to your Telerik account and download the Telerik UI for ASP.NET AJAX installer again. To verify that the new download is not corrupt, use an md5 hash sum calculator, for example, the fciv utility is such a tool.
Download the installation file to a non-compressed drive.