You can transfer the project to KiCad, but the best path depends on what you want to finish there:
Best option: export manufacturing/layout files
From Flux, export:
- Gerber ZIP — PCB copper, solder mask, silkscreen, drill, board outline
- BOM CSV — parts list
- Pick-and-place CSV — placement data
- Netlist if available — helps cross-check connectivity
Then in KiCad:
- Open KiCad → GerbView.
- Load the Gerber ZIP/drill files to inspect or manually recreate routing.
- Use the BOM and placement CSV as references.
- If you need editable KiCad PCB data, you’ll likely need to manually rebuild/import from these references, because Gerbers are manufacturing outputs, not fully editable design files.
Important limitation
Gerbers do not convert cleanly back into a KiCad schematic + editable PCB. They preserve the board artwork, but not design intent like components, nets, rules, or schematic symbols.
Better practical workflow
Use Flux to export:
- PDF schematic or schematic screenshots for reference
- BOM
- Gerbers
- Pick-and-place
- IPC/netlist if available
Then recreate the schematic in KiCad using the same parts and use the Flux routed board/Gerbers as a visual reference.
Before exporting
Your board still had unresolved routing cleanup issues last time:
- remaining airwires/unrouted connections
- copper overlap conflicts may need final verification
So I would not manufacture directly from the current Gerbers without checking them in a Gerber viewer first.