I purchased the Nuendo 5.0 upgrade from 4 early last week and finally installed it yesterday. It took multiple attempts as i found out that Lion 10.7 does not play nicely with certain VST2 plugs, had to remove them one at a time until the issue fixed itself and 5.0 would finally open. Next I tried to update to 5.5 but it kept asking for a new code and the old one for 5.0 didn’t work. I see here in the forum that Steinberg has to deposit a new code in my account , How long will that take?