SOI Connectors download page does not contain a link to download the APM Connector:
A new version of the SOI APM connector is being developed that migrates from Oracle JDK to AdoptOpenJDK for On Prem and SaaS instances.
In the meantime, the old version has been removed from public access.
DX APM 10.x
DX APM SaaS
The previous version of the connector is attached to this internal document
The new APM 4.0.1 will be GA and available for download at the end of Feb.