I have tried downloading mu ss2, ss6, ss15, ss17 and I can log in and play normally.
As for ss18, I tried downloading a few files from different websites, they all had the same situation as above.
I think I need to change something in pc or main.exe
https://drive.google.com/file/d/13R1l5peNB0NSA4TkSpWMwq8A9l5ChN_g/view?usp=sharing
I tried adding another 4gb ram to make it 8gb, but the results still didn't change.
I tried downloading mu bless, mu ss17 and both work normally, no errors at all