2.2.8 is still in beta stage AFAIK. BuildBox customers should be able to obtain the download link for the Beta app from @Andy or from BuildBox support...
@Andy specifically asked us, customers to not to share the link outside of the BuildBox Customers area... Anyways...
Andy put that link on the forum actually and that link is to customers only part of the forum so cannot be downloaded by other users. No worries
@Neverafter You should have got access automatically. The most common reason for it not happening automatically is using a different email address. Just send an email to support@buildbox.com and you will get hooked up.