Allows PsiMac to be used with a Macintosh OS Description This is an upgrade to PsiMac 1.0.x which fixes a problem with Mac OS 8.5 and makes your version of PsiMac fully Year 2000 compliant. Installation Once you have downloaded the file, use a suitable program to expand the files, such as StuffIt Expander™. Double click on the resulting file to install the update. Note If you have Psion MacConnect installed over PsiMac, then you must download the MacConnect update instead.