Audio Ease released a new version 7.1 of Altiverb which is AAX 64 compatible. Altiverb 7.1 is Mac-only and requires iLok and Pro Tools 11.0.2 or later so it’s not TDM or RTAS compatible. If you bought Altiverb 6 in 2010 or 2011, you’ll get the upgrade for free.