I recently switched to MAC and the DIY websites I have designed no longer allow me to use the WYSIWYG editor cuz it only works with Internet Explorer 5.5 or higher.
Is there a plug-in or download that lets a version of IE 5.5 or higher run on a MAC?
Unfortunately, they are probably requiring IE on Windows due to the editor probably being an ActiveX plugin which only works on Windows. There was never a 5.5 version of IE on the Mac. Only 5.1.x on OS 9 and 5.2.x on OS X.
The other thing you could try is using a standalone WYSIWYG HTML editor like Nvu. Then you could still use Safari/Firefox/<insert-favorite-browser> as IE on the Mac has not been in development for some time.