This is the only post I'll ever do in this forum, so I hope it helps: I tried updating from 1.13 to 1.14 and the LOD patcher ran into an error saying "d2exp.mpq does not exist", so I went to the regedit, jumped into HKCU/Software/Blizzard Entertainment/Diablo II. Edited DiabloIICD, InstallPath, Program and Save Path keys pointing to my Diablo II folder. Then jumped to HLM/SOFTWARE/Blizzard Entertainment/Diablo II and edited the same registry keys. Then the patcher proceeded as normal. After it finished, the game started and shown a beautiful 1.14 in the bottom-left corner. So I found out it's not needed (at all) to do a clean reinstall.