Even when it's readily available the solution is not simple. This is one portion of my current list:This does become an issue though when an asset is moved to payware and is no longer available anywhere else.
CM will not download the Obsolete versions. Even if I was prepared to take the effort to increment the KUID to override the payware version, I can't do the download easily from CM. There are 250 that fall into a similar state (previously 'Available for Download', newer versions now 'Installed, Payware', or 'Built-in'. That includes no routes or sessions, but it does include some speed trees which have become irrelevant. People who have purchased more payware routes would probably have more items in this category. It's not a small problem. N3V has the mechanism for fixing this, with volunteers available. All it needs is the will to do it.