Start Diablo II LoD. Do not load your character directly. Instead, click and observe the character list. The game will display a message: "Converting character files to newer version. This may take a moment."
Diablo 2 LoD character save files patched, .d2s compatibility, 1.14d save editor, fix corrupted character, forward porting saves. diablo 2 lod character save files patched
Because 1.14 removed TCP/IP hosting, patched saves now serve as time capsules. You can’t drop-trade between versions easily, but you can forward a 1.10 character through every patch to 1.14, preserving its original quest log and waypoints. Start Diablo II LoD
Not reliably. The game's item codes and skill IDs change. However, you can attempt this: The game will display a message: "Converting character
(D2R), the evolution of character save files—the .d2s files—remains one of the game's most enduring "accidental" triumphs.
The following are highly-regarded collections and tools based on community feedback and utility: Top Character Save Collections & Sources