We retart computer while holding down the C key. Then click reinstall 8.5. It appears to be working fine till the very end when it gives us the error message.

Not sure this is the right place to ask, but my friend has a G3 Imac that just started giving him error messages when he tries to go online. He has dial-up only. The following messages appear when trying to re-install OS 8.5:

"The application Mac OS setup assistant could not be opened because "File ...