When you enter the backend of the site then the version in the configuration will change.
The steps you took are correct and I want to add some more clarifications.
- Created Project in Sitefinity 4.0
( log to the backend in order to have an active project, if you have just created a project in the project manager the database is not populated )
- Installed SItefinity 4.1 and then in Product.xml file of Sitefinity4.1 i changed Url and LocalPath to my Project which is in Sitefinity 4.0
( for example take Sitefinity 4.1 project manager and Projects.xml and place them in some folder in the file system. Create Projects folder where you have placed the project manager place your 4.0 project in this folder and modify the Projects.xml to search for the project files in this folder. Upgrade your project )
The error you get is caused by some problem of the upgrade procedure. It points the old assemblies.
Can you please retry the upgrade procedure following my recommendations and get back to me if you still experience problems.
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