Unfortunately, a ZIP must be formatted with ZipTools 4.2 in order to be recognized on a Mac Plus, or a low level disk formatter. See this thread:
http://68kmla.org/forums/viewtopic.php?t=2544
As for Wish I Were ... it's not really needed for the Plus up to 7.5.5. The installer will allow you to custom configure the install for the Plus, which is best kept minimal.