If you're playing pc offline, default location the character save files are saved is: This PC > Local Disk (C:) > Users > whatever your login is > Saved Games > Diablo 2. This is NOT the same location where the actual game is stored on the C: drive (which will be under program files).
Copy your saved file according to the name from the classic version of the game. By default, the file should be available in the given location C:\Users\UserName\Saved Games\Diablo II. The saved file should go by the format XYZ.d2s. Remember the .d2s extension. Screenshot by Pro Game Guides.
Can you create another offline character and get into a game? If not, then that indicates that the shared stash file is corrupt. Deleting (or moving it out of the save game folder) should fix that, but at the cost of everything in your shared stash.
D2R - OP Save Files. Resurrected. Handful of save files here. There is a duplicate name between the Paladin with all the runes in the first pack, and the paladin in the second pack. I recommend using the former if you download them all. This includes a 99 sorc with 1k all stats 20 all skills several high runes and some good/some bad items, and
Both Online and Offline modes have their advantages and disadvantages in Diablo II: Resurrected. Offline mode has some special perks to make solo play more enjoyable.
Start Diablo 2 Resurrected and make a new character. Save & Exit. Close game; Copy your corrupted character and new one to a test folder, and another time to a back up folder. Open the Hex editor and open the d2s file of your corrupted and new character in your test folder. Type in google: neoseeker diablo 2 hex edit, and you will find a Saved
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diablo 2 resurrected offline save location