Patch 1.14d moved the default save directory, which often causes the "File Not Found" error in older editor versions. Follow these steps to "fix" the editor for 1.14d:
Hero Editor allows players to bypass the grind of single-player mode by directly manipulating .d2s character files. Key capabilities include: hero editor diablo 2 lod 114d fixed
: Max out skills or experiment with builds without needing to find rare "Token of Absolution" materials. Patch 1