How to redeem code for Ghostbusters VR?

My Acer Mixed Reality device came with a voucher for a free copy of Ghostbusters VR. However, I cannot get the code. I registered the device, but when I go to go.acer.com/ghostbusters and click the "redeem" button (as described here: https://us.answers.acer.com/app/answers/detail/a_id/51791/~/how-to-redeem-the-ghostbusters-vr-free-download-included-with-the-acer-windows), I see a spinning doughnut for a second, but nothing else happens (not code on the screen, no code in mailbox). I tried IE and Edge, same result. I feel a bit fooled because this free game was promised and is therefore a part of the deal. Can anybody please help?

Regards, Dago