If it's not working here are some things to test:
Try running as administrator
Make sure you are allowing it through your windows firewall.
Go to the following link and Click Download .NET Framework 4.8 Runtime and then install it
https://dotnet.microsoft.com/download/do...work/net48
Please note that the ClassicUO client has razor built-in, you don't use razor to run ClassicUO. You run ClassicUO and IT'S version of razor launches automatically.
NEW
Try running as administrator
Make sure you are allowing it through your windows firewall.
Go to the following link and Click Download .NET Framework 4.8 Runtime and then install it
https://dotnet.microsoft.com/download/do...work/net48
Please note that the ClassicUO client has razor built-in, you don't use razor to run ClassicUO. You run ClassicUO and IT'S version of razor launches automatically.
NEW