Which CMDLs did you try?
Uhhh. Actually, I probably updated the other maxscript files as well at some point. Try replacing all of them here and see if it works then.
-- Error occurred in ReadBELong(); filename: F:\cmdl\scriptheader.ms; position: 529; line: 15 -- Frame: -- fstream: <BinStream:F:\metroid prime hacking\Prime 2 PAKs\Metroid1.pak_dir\1_cdf1c541.CMDL> -- long: undefined -- called in s loop; filename: F:\cmdl\cmdl.ms; position: 1969; line: 42 -- Frame: -- s: 57726 -- called in anonymous codeblock; filename: F:\cmdl\cmdl.ms; position: 2018; line: 44 -- Frame: -- magic: 357504 -- material_offset_array: undefined -- model_format: -1380270592 -- mtl_count: undefined -- f: <BinStream:F:\metroid prime hacking\Prime 2 PAKs\Metroid1.pak_dir\1_cdf1c541.CMDL> -- section_count: 1049026295 -- mesh_nrm_array: undefined -- material_section_count: 1072069246 -- prim_vertpos_array: undefined -- mesh_uv_array: undefined -- mtl_array_start: undefined -- prim_vertnrm_array: undefined -- mesh_face_array: undefined -- section_size: #(1292049229, 88324, 1074135428, -1064370176, 2099968, 1635778721, 6293760, 257490947, 1560282190, 50487451, 50372768, 218107981, 613636, 374145583, 1560282461, 22695425, 601885952, 123535386, 1291979857, 84172034, ...) -- prim_vertuv_array: undefined -- mesh_vertex_array: undefined -- mesh_mat_array: undefined -- u_array: undefined -- prim_mat_array: undefined -- v_array: undefined -- current_section: undefined -- num_uvs: undefined -- current_offset: undefined -- num_verts: undefined -- cmdlmesh: undefined -- next_offset: undefined -- tex_fileID_array: undefined -- num_submeshes: undefined -- tex_array: undefined -- material_array: undefined -- vertex_array: undefined -- dir: "F:\metroid prime hacking\Prime 2 PAKs\Metroid1.pak_dir\" -- version: 430774750 -- vertex_attrib_flag_array: undefined -- MM: undefined -- texturecount: undefined -- submesh_offset_array: undefined -- Error occurred during fileIn in #F:\cmdl\scriptheader.ms; line number: 15 >> MAXScript FileIn Exception: -- Unable to convert: undefined to type: Integer64 <<