Strange. Same here, 10.11.6.
I can't recall which mirror I used for DL. As it works for you, there may be another obstacle on Rax´s side.
It must be my system, because I've tried with several different install medias. Unless I managed to download several different broken images in a row.
My system specs:
Windows 10 64-bit
Nvidia GTX 960m
I don't think that really has much to do with it.
I've tried with various compatibility settings, so if my OS is the problem, then it's a Windows 10 issue.
The program is being run in admin mode, and I've set all my images so far to read-only.
I also just tried with a toast file I found on macintosh garden, set it to read-only, and got the same error (again it's a windows c++ runtime error).
Maybe sheepshaver isn't working well with another program on my system?Edit
I just tried with the 8.5 toast file from the link above and it booted just fine. Can I just go download one of the os 8.6 update files on macintosh garden, and how would I install that?