Twixtor regular 1, 2 or 3 to Twixtor regular 4.x upgrade, Macintosh $49.95 Twixtor regular 1, 2 or 3 to Twixtor regular 4.x upgrade, Windows $49.95 Twixtor Pro (2 or 3) to Pro 4.x Upgrade, Macintosh $149.95, 5/$637.29 Twixtor Pro (2 or 3) to Pro 4.x upgrade, Windows $149.95, 5/$637.29 Twixtor regular (vers. 1,2,3 or 4) to Pro 4.x Upgrade, After Effects plugin, Macintosh $265.00, 5/$1,126.25 Twixtor regular (vers. 1,2,3 or 4) to Pro 4.x Upgrade, After Effects plugin, Windows $265.00, 5/$1,126.25