Vir2 Instruments Acoustic Legends HD - Manual (Page 70)

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Check the system requirements for the Kontakt Player product which
you want to use. The minimum requirements are the very least you
can get by with, and are often not enough for larger projects. If your
project calls for more instruments, more plug-in instances, etc.
updating your RAM may save you a lot of trouble.
Make sure you have the most recent Kontakt Player 2 version.
Make sure that you have not clicked on an outdated application
alias/shortcut.
Try to restart your computer. Disconnect any audio interfaces and
computer peripherals like printers, scanners and the like.
My soundcard / MIDI device is not recognized:
Quit all open applications.
Disconnect and reconnect the device. Try another USB / Firewire
port if one is available. Connect the device directly to the computer
and not via a USB / Firewire hub.
Open Audio MIDI Setup (Mac OS X) and see if the device shows up
there. Test the MIDI setup for MIDI received.
Update any soundcard / MIDI drivers from the manufacturer’s
website.
Deinstall and reinstall your soundcard / MIDI drivers.
I don't hear any sound:
Without being too product specific, there are usually two reasons for
this problem. It is either MIDI or soundcard/routing related.