Connection from neo4j Desktop to localhost postgresql Database?

Dear Ladies and Gentlemen,

I am currently using neo4j Desktop 1.5.9 and want to access a Postgresql 16 database. I have installed apoc 4.4.0 - full - and can load the apoc.load and apoc.load.driver etc.. I also have in the "C:\Program Files\neo4j-community-5.15.0\plugins" directory: the recommended "postgresql-42.7.1.jar" file and the "apoc-4.4.0.23-all.jar" file. I have also checked the neo4j.conf file and the following additional lines:

dbms.security.procedures.unrestricted=apoc.,jdbc
dbms.security.procedures.allowlist=apoc.
,jdbc

I have also created apoc.conf file with the entries:

apoc.jdbc.postgresql.enabled=true
apoc.jdbc.postgresql.url=jdbc:postgresql://localhost:5433/web_db?user=postgres&password=****

When executing the command:

CALL apoc.load.driver('org.postgresql.Driver')

I get the following error message:
Failed to invoke procedure apoc.load.driver: Caused by: java.lang.RuntimeException: Could not load driver class org.postgresql.Driver org.postgresql.Driver

The database is running and I have access with PgAdmin.

Thank you very much for your tip!