I am not sure what I did wrong during the process of installing the GIS add-on, but for some reason even after unchecking and rechecking its checkbox in Preferences, there is still no sign of any sort of GIS option in Blender. Not even if I searched it in the "Operator Search".
Also, is the GIS add-on able to work with both Cycles and Eevee? I tried switching between the two, but nothing happened. If you have any suggestions for what I could do to fix this issue, please let me know.