Download links:

1. Latest(Released on Aug 24th 2020): http://packages.confluent.io/archive/6.0/confluent-community-6.0.0.zip 
2. 5.5.1: http://packages.confluent.io/archive/5.5/confluent-community-5.5.1-2.12.zip

Extract the download zip 

Folder Structure: 

Run Command:

1. zookeeper: bin/schema-registry-start etc/schema-registry/schema-registry.properties

2. Kafka: bin/kafka-server-start etc/kafka/server.properties

3. Schema registry: bin/schema-registry-start etc/schema-registry/schema-registry.properties

4. ksqldb: bin/ksql-server-start etc/ksqldb/ksql-server.properties