Sage 50 Canadian Edition Activation

I had to do a fresh install of Windows 10 on my PC thus I had to reinstall my Sage 50 Canadian Edition. This edition is authorized for 5 users and I think we already have 5 users so we are maxed on it.

When I use my account information to register the product, it keeps failing. The error says "Sage 50 cannot find a Key Code registered under the given product serial number and account ID......

How can I get my Sage 50 registered? I have 14 days left.