Apple has dropped the downward compatibility for older installers. As a result, AkustiX is not longer compatible with MacOS Sequoia.
It is not possible to add compatibility for it with reasonable effort.
However one of our customers was able to make it work:
"There is a workaround for you though, if you extract the VST and Audiounit files with software like Pacifist and copy them to your plugins folder "HD / Library / Audio / Plug-Ins..." (To the VST and Components folder) Then it will work on Mac if you run Akustix through Rosetta."