How do I use WinHex to repair a corrupted chunk of data?

I don't know of a repair tool for an imgc file and here is the error message I'm getting when trying to write with the HDD Raw Copy Tool Access violation at address 0040608 in module "HDDRawCopy1.20Portable.exe". Read of address 8591F84A. My question is how do I find that and repair it so it can get past the 74% mark when writing?

For more context https://www.reddit.com/r/datarecovery/comments/186yhtt/how_do_i_repair_this_corrupted_chunk_of_data/

2 comments

I answered in of your many posts (removed and understanbly, you still have 9 of them about this issue, who knows how many removed ones?!!?!) about the first program found by Google on github that would convert these images. What does that do?

You won't be able to blindly modify a corrupted block so it doesn't blow up some decompression algorithm in a program where you have only the binary for the program. But with an open source program, first of all it might not crash, and even if it does you'd be able to see the line and edit it to not crash or give up when something isn't the expected value.
Same answer as the last time you posted https://www.reddit.com/r/datarecovery/comments/186yhtt/how_do_i_repair_this_corrupted_chunk_of_data/