@dannyp1
You don't need to buy another license. The version from Aminet is the most recent one and if your license key works with it, it's perfectly legal.
I never heard that IDEfix only works with 3.0 and below. It was made to work with 3.1 at least. And the version from Aminet works perfectly with OS 3.9 even *without* changing anything (scsi.device).
Those people complaining about IDEfix not working with 3.9 have older versions, mostly OEM versions without a key and are not able to upgrade to the latest version for free.
Bye,
Thomas