KiCad 7 can't open the schematic or pcb editor

[retiredfeline]

Try removing the v5 personal config files as mentioned here:

[SOLVED] 7.0.2 Cant open schematic

Some people have experienced issues where the old personal config files from v5 are present. They are located in ~/.config/kicad on Linux and the equivalent directory (don’t know it off the top of my head) on Windows. Move those out of the way, then run KiCad v7 again and it will give you a fresh start.

The config directory for various OSes is stated in the Getting Started document as the directory where the personal library tables are stored: Getting Started in KiCad | 7.0 | English | Documentation | KiCad