My brain needs a firmware update !!!

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Last time I posted here I had just done a firmware update to V5.0 on my PIII upgrade. All has been working fine and i really found no need to update. But now i was looking to buy the Vortech inter-phase and the need for a firmware upgrade is warranted . I cannot remember how i did it last time. I am running a Mac w/ vista on it. Using a USB to serial adapter (Same as last time). Downloaded the 5.06 version to my desktop, and when i try to update from the Profilux Control. It begins I get a error message saying i am connecting with Lan or Wlan. help ! Don't know what I have missed. It worked last time ... Neil