[SOLVED] I cannot install Blazorise in my Blazor server side app. I get the Error that "Microsoft.AspNetCore.Blazor" package could not be find

I cannot install Blazorise in my Blazor server side app. I get the Error that "Microsoft.AspNetCore.Blazor" package could not be find

I have a blazor server side app that is working without problem. (Net Core 3.1). I tried to install Blazorise according the quick start page in https://blazorise.com/docs/start. As my server has no internet access I have downloaded the packages "Blazorise.Bootstrap 0.7.2" and "Blazorise.Icons.FontAwesome 0.9.2.5".

I can install the "Blazorise.Icons.FontAwesome" without Error. But if I try to install "Blazorise.Bootstrap" I get the Error

"NU1101: Unable to find package Microsoft.AspNetCore.Blazor. No packages exist with this id in source(s): Microsoft Visual Studio Offline Packages, Package source"

I cannot find any package like "Microsoft.AspNetCore.Blazor". What should I do now?

Update1: I have found a package like "Microsoft.AspNetCore.Blazor.Templates 3.1.0-preview4.19579.2" but if I try to install I get Error

"Package 'Microsoft.AspNetCore.Blazor.Templates 3.1.0-preview4.19579.2' has a package type 'Template' that is not supported by project 'WebApplication7'"

Solution

I had some problmes at the beginning with updateing NetCore3.1 to Net6.0 But at the end I fixed them. So I could install Blazorise's last version without problem. Thanks for the comments, suggesting that.