“Cannot load solution – unsupported version.” Fix: SharpDevelop 4.4 does not support .NET Core/.NET 5+ projects or the new SDK-style .csproj . It only reads the classic format.
Debugger won’t attach. Fix: Run as administrator (if using Windows 8/10) or disable UAC temporarily. Is SharpDevelop Still Alive? The Future of 4.4 Portable The original SharpDevelop project officially ceased active development around 2017. Version 4.4 is now abandonware – but that’s precisely why the SharpDevelop 44 portable hot download is so valuable. It will never change, never phone home, and never bloat. sharpdevelop 44 portable hot download
For quick edits or working on older hardware, SharpDevelop 4.4 still wins. Issue: “.NET Framework 4.5 not found” error. Fix: Ensure the target machine has .NET 4.5+ installed. Windows 10/11 usually does. For Windows 7, download the runtime from Microsoft (it’s free). “Cannot load solution – unsupported version