Try making a post in this thread …
How/When shall I receive the Cubase LE 12 upgrade from LE 11 e-licencer - Cubase - Steinberg Forums
… and tag @Matthias_Quellmann.
You might be able to get a free update from your AI4 to the current version using Steinberg Licensing.
As you have already discovered, there is no upgrade path to Elements for versions older than AI12 (the first version using Steinberg Licensing).