myuser@HP-MICROSERVER:~$ DOTNET_FILE=dotnet-runtime-8.0.11-linux-x64.tar.gz
myuser@HP-MICROSERVER:~$ export DOTNET_ROOT=$(pwd)/.dotnet
myuser@HP-MICROSERVER:~$ mkdir -p "$DOTNET_ROOT" && tar zxf "$DOTNET_FILE" -C "$DOTNET_ROOT"
myuser@HP-MICROSERVER:~$ export PATH=$PATH:$DOTNET_ROOT:$DOTNET_ROOT/tools
myuser@HP-MICROSERVER:~$ cd ~/.wg++
myuser@HP-MICROSERVER:~/.wg++$ ~/.wg++/run.net.sh
You must install or update .NET to run this application.

App: /home/myuser/.wg++/bin.net/WebGrab+Plus.dll
Architecture: x64
Framework: 'Microsoft.NETCore.App', version '8.0.0' (x64)
.NET location: /home/myuser/Downloads/.dotnet/

The following frameworks were found:
  7.0.20 at [/home/myuser/Downloads/.dotnet/shared/Microsoft.NETCore.App]
  9.0.0 at [/home/myuser/Downloads/.dotnet/shared/Microsoft.NETCore.App]

Learn more:
https://aka.ms/dotnet/app-launch-failed

To install missing framework, download:
https://aka.ms/dotnet-core-applaunch?framework=Microsoft.NETCore.App&framework_version=8.0.0&arch=x64&rid=linux-x64&os=ubuntu.20.04

myuser@HP-MICROSERVER:~/.wg++$ dotnet --version
9.0.100