This in particular caught my eye in https://my.smithmicro.com/#collapse37 :
"Final" versions of 10.1.3, 11.2 and 12.5 are listed.All versions of Anime Studio as well as version 12 of Moho have been discontinued and support is limited. Consider moving to Moho 13 to get all the latest features by going to:
https://www.mohoanimation.com
NOTE: All Moho 12 and Anime Studio users should download and install the final available version listed below (active license required):
What's important to understand is that these versions are indeed slightly different than the versions I got upon original purchase. For example, the 12.5 version available for download is slightly different than the 12.5 version I purchased last year. What's different? Well, the Software Manager option is missing from the Help drop-down menu. So, I'm assuming this means these versions do not require you to have a Smith Micro account to manage licenses.
Whatever the case, I downloaded these "final" versions. Then I deactivated the license for the installed version and uninstalled it, then I installed the Final version and input my license key(s).
I'm hoping this means I don't have to worry about the fallout from Smith Micro disappearing along with their license servers.