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DesignSpark PCB 7.2 crash - damaged PCB design



I was designing my PCB (PCB design). I clicked on Optimize nets and then message displayed that DesignSpark must close due to some error. After that, everytime I opened my PCB design DesignSpark crashed.

I reinstalled DesignSpark PCB 7.2 and now I get "Unexpected file format" when opening that PCB design. I get same error when I open security copy of my PCB design (~ prefix). Other PCB designs opens.

I need to recover my PCB design as I spent hours on it. Please help. I can send you the PCB design if you are able to recover it.

Also it would be very nice if that never happens again as this issue is making DesignSpark PCB software unusable. DesignSpark PCB crashes quite often for me (however it is for first time it damaged my files).