it isn't working for me- i get "cannot find E6M1" in the console when i try to play Sigil 2
Yeah it was telling me WAD Sigil_II not found.
Turns out that the .wad file you get in the zip file from the romero games website is named SIGIL_II_V1_0.wad, and renaming it to SIGIL_II.wad worked.
I couldn't get the .wad file with the THORR soundtrack to work without also renaming it to SIGIL_II.wad (it currently comes named SIGIL_II_MP3_V1_0.wad and i tried renaming it SIGIL_II_MP3.wad and that didn't work)
Huh that is odd. The script will look for SIGIL_II_V1_0.wad and SIGIL_II_MP3_V1_0.wad (case insensitive) as they are named from Romero's website. It will copy them to a sigil_ii.wad if found, then continue the import with that name.
I tested this successfully on Linux and Windows. There must be some other difference between our setups. Or a bug. But I'm glad you got it working :-)