Tekla Structures 21.1 requires a 64-bit Windows environment and at least 8GB of RAM , though 16GB or more is recommended for complex modeling. Tekla User Assistance
Because Tekla 21.1 is a legacy version, it has specific "enemies" in modern software: tekla 21.1 system requirements
Here’s an interesting angle on that search phrase, — because it sits at a unique crossroads in Tekla Structures’ history. Tekla Structures 21
At least (NVIDIA GeForce or Quadro being the industry favorites). tekla 21.1 system requirements
Tekla 21.1 reached End of Life (EOL) before Windows 11 launched. While it installs on Win 11, the OpenGL translation layer causes random crashes during numbering. Stick to Windows 10 for 21.1.