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Have you updated the firmware on the ACA500+. If so all you need to do is enter the Installer ie F7 on powerup. And option F5 installs the software onto your hard drive. This worked fine for me with OS3.1 but not with OS3.9.
OS3.9. I just copied the ADF to a usb stick and used it on a Gotek drive.
Unfortunately each copy of the installer you download off the server as its own copy of AMITCP: licence in it i believe.
This is probably why you only get a limited number of downloads of the installer.
Make sure you save a copy to a storage device for later use.