Sorry that didn't work for you, Jack.
Before installing v4, Francis also recommends that you delete the older version of the Keyspan driver from:
• {your hard drive} /Library/Extensions
• {your hard drive} /System/Library/Extensions
and empty the trash.
If that doesn't work either, try disabling the SIP and then installing v4.
See Francis' blog:
Disable SIP instructions
P.S.: I replaced my Keyspan some time ago with a Shipmodul Mutliplexer that has a direct USB cable or WiFi for the Mac.
Before installing v4, Francis also recommends that you delete the older version of the Keyspan driver from:
• {your hard drive} /Library/Extensions
• {your hard drive} /System/Library/Extensions
and empty the trash.
If that doesn't work either, try disabling the SIP and then installing v4.
See Francis' blog:
Disable SIP instructions
P.S.: I replaced my Keyspan some time ago with a Shipmodul Mutliplexer that has a direct USB cable or WiFi for the Mac.
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Jon Longworth
Jon Longworth