The official game is cheap. Diablo 2: Resurrected ($39.99) often goes on sale, and original CD keys are $10–15 on secondhand markets. The effort to build your own portable 1.13c folder is minimal.
repack, the most significant "useful feature" is the (usually the G key), which instantly switches the graphics back to the original 2000s look. diablo+2+lod+113c+portable+fitgirl+repack+full