Error when trying to upgrade to umbraco cloud 15 to 16

Questions
1

A screenshot of Visual Studio shows the NuGet Package Manager for an Umbraco project with error messages indicating package version conflicts and constraint violations during package restoration. (Captioned by AI)
A screenshot of Visual Studio shows the NuGet Package Manager for an Umbraco project with error messages indicating package version conflicts and constraint violations during package restoration. (Captioned by AI)1886×990 245 KB

Visual Studio shows the properties of the UmbracoProject application with configurations like output type set to Console Application and target framework set to .NET 9.0, alongside error messages indicating package conflicts and dependency issues within the project. (Captioned by AI)
Visual Studio shows the properties of the UmbracoProject application with configurations like output type set to Console Application and target framework set to .NET 9.0, alongside error messages indicating package conflicts and dependency issues within the project. (Captioned by AI)1893×997 227 KB

A computer screen displays documentation for upgrading a project using Visual Studio within the Umbraco CMS, providing step-by-step instructions and recommendations for a successful upgrade process. (Captioned by AI)
A computer screen displays documentation for upgrading a project using Visual Studio within the Umbraco CMS, providing step-by-step instructions and recommendations for a successful upgrade process. (Captioned by AI)1902×982 218 KB

This screenshot shows a graphical interface of a code repository, likely using Git, displaying the commit history, branch management, and file changes within the 'dev-zettabyte-resources' project. (Captioned by AI)
This screenshot shows a graphical interface of a code repository, likely using Git, displaying the commit history, branch management, and file changes within the 'dev-zettabyte-resources' project. (Captioned by AI)1879×1006 202 KB

Dear Umbraco Support,

I’m trying to upgrade to Umbraco 16.
Currently using umbraco cloud 15.
I don’t know if the error is caused by this branch that I see in ‘Fork’.
How do I merge the branch in Fork.

Thanks.

regards
Jamie