Avoid “Save for Older Version” for production PCBs. Use Gerber export for fabrication and upgrade all licenses to the same version for editing.
| If you are on... | And need to open in... | Action | |----------------|----------------------|--------| | Proteus 10 | Proteus 8 | Save for Proteus 8 → expect loss of 3D & high-speed rules | | Proteus 9 | Proteus 8 | Save for Proteus 8 → minimal loss (mostly safe) | | Proteus 8 | Proteus 7 | ❌ Not possible. Use EDIF or upgrade target. | proteus save for older version