In the whole history of Poser there has only been ONE 1 case of where an older version of Poser received an update after the next version was out and that was was with Poser 10 when both Windows and Mac made several security changes that broke the Library functions in Poser 10. Other then that once the new version is out the old program has never received any more fixes. You have an issue with Poser 10 not doing something then the answer is to upgrade to Poser 11 or with 11 then use 12.

Currently I have Poser 5 through 11 running on my machine in my office. They each have their own program folder (which is something the Programmer's did) so upgrading to the next version it will also have it's own program folder. There are other programs (NOT Poser) that when you upgrade the program will over write the prior version as they live in the same folder and use the same settings etc. So when Tim says they don't plan to invalidate the Poser 11 license for those that upgrade to Poser 12 that is to allow people to continue to use the prior version. There is nothing is his statement that even vagally implies that Poser 11 not continue to run for all users. The changes to Poser will make it so you should keep both versions, especially if you have something that works in 11 and not 12 like Python scripts since 11 uses 2.7 and 12 will use 3.7.9

Not sure where you came up with the idea that Bondware is going to kill Poser 11. That they won't put anymore effort into fixing Poser 11 is not the same as killing it. At the college where I work we have 100's of servers all running on one set of hardware, so they idea that it is costing anything to maintain the server (over normal costs) is not valid.

Poser 5, 6, 7, 8, Poser Pro 9 (2012), 10 (2014), 11, 12, 13