by dmitri » Tue Jul 05, 2022 7:09 pm
The schematics for the Atmega version were created back in 2011 with whatever version KiCad was available at the time. The schematics have not changed since then. If I remember right, the symbols should be cached in the schematics. If you cannot read the schematic with recent KiCad versions, then you can just re-draw the schematic in a latest KiCad version or in any other design app (it is not a complicated design with not so many parts) using the PDF schematic as a guide.