I'm trying to downgrade My C# Winform (Discount Card) from .NET 8.0 to .Net Framework 4.8 in the hope of being able to use the Link-OS SDK. 

I succeeded in downgrading the Data Layer, Business Layer, Presentation Layer like this:

<Project Sdk="Microsoft.NET.Sdk">  
    <PropertyGroup>  
      <OutputType>WinExe</OutputType>  
        <TargetFramework>net48</TargetFramework>  
        <LangVersion>10.0</LangVersion>  
        <ImplicitUsings>enable</ImplicitUsings>  
    </PropertyGroup>  
      <ItemGroup>  
        <Reference Include="System" />  
        <Reference Include="System.Core" />  
        <Reference Include="System.Xml.Linq" />  
        <Reference Include="System.Data.DataSetExtensions" />  
        <Reference Include="Microsoft.CSharp" />  
        <Reference Include="System.Data" />  
        <Reference Include="System.Deployment" />  
        <Reference Include="System.Drawing" />  
        <Reference Include="System.Net.Http" />  
        <Reference Include="System.Windows.Forms" />  
        <Reference Include="System.Xml" />  
      </ItemGroup>  
      <ItemGroup>  
        <Using Include="System.Windows.Forms" />  
      </ItemGroup>  
  </Project>

But failed when downgrading the Service Layer, because I used gRPC to share resources and it is not supported by the .Net Framework!

I want to use the ZC300 Card Printer in My Project, but I am hampered by the Link-OS SDK not supporting .NET 8.0. 

Are there any developers here experiencing the same problem as me, and what is the solution?

Thanks,

Best Regards,

Erwin