Re: Critical error
If it's not already the case, download the last QElectroTech version (0.7 rc1) and check again if you got the directory at
C:\Users\Carugin\AppData\Local\stalefiles\QElectroTech
to be sure the directory will be created, launch QElectroTech and open an existing project (not create a new one).
Another thing to test, launch QElectroTech open an existing project (make a copy before to avoid a new lost) then open the system monitor of windows and force QElectroTech to close (at the point of view of QElectroTech, it's like a crash).
Then relaunch QElectroTech, a dialog should appear and ask you to open a backup file.