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Is this a T-Mobile branded phone? I do not think the Note 5 had wifi calling natively. It can only be found in a T-Mobile phone. There is no download for this.
Hey there! Our pillars are spot on here - you'll need a phone with T-Mobile software to complete Wi-Fi calls while using T-Mobile service - but if your Note 5 is T-Mobile branded and you're having trouble, we definitely want to help out! Did you have a chance to take a look at the support page that theartiszan linked to above? Please let us know if that was helpful or if you're still having difficulty getting this working!