The message is “Unable to install because a new version of this product is already installed.” But it is not installed and has never been installed. Thanks for any assistance.
There are two products.
1- Aspose.Slides for .NET
2- Aspose.Slides for Reporting Services
You might have run the second’s Setup. It has been fixed for latest version Aspose.Slides for RS 220.127.116.11 but if it you are getting the problem, then you can also manually install it.