Does the version you downloaded contain SSG files?
When 3 is a small "SSG ファィルのを?", a dialog box "Incorrect なファィルで〣" will pop up.
Or does it only appear when you choose a folder?
There's nothing I can do. I will send you my spoiler.
Mine is ready. ....
This method is a bit rude.
Change any non-F disk (except system C disk) to F disk letter.
, should be able to solve, the specific method, anywhere search, modify the drive letter can be found.
To sum up, method 5 has a high success rate, and it is recommended to try. If it's 4, it's a little troublesome > <