Even with a clean install, V12 has known bugs. Here is how to fix them without reinstalling.
✅ Windows Pro, SSD, 16+ GB RAM ✅ Cleaned previous Aspen installations ✅ Installed prerequisites manually ✅ Used local SLM license ✅ Custom installation (only HYSYS + Properties) ✅ Verified SQL Server is running ✅ Tested with a simple water stream how to install aspen hysys v12 better