While there are websites offering a "free download" of SmartPlant 3D 2018, we must caution users about the potential risks. Downloading software from unauthorized sources can expose users to malware, viruses, and other security threats. Additionally, pirated software can lead to compatibility issues, bugs, and lack of support.
If you are looking for a free and open-source alternative to SmartPlant 3D, you may consider the following options: smartplant 3d 2018 best free download
For learning , FreeCAD with the Flamingo workbench (piping add-on) is the closest open-source alternative. While there are websites offering a "free download"