While performing a database migration from Neo4j 4.4.x, an attempt to replace the 4.4.x binaries with 5.x using the existing folder structure resulted in the following error: 

Caused by: com.neo4j.causalclustering.core.state.migrate.ClusterStateMigrationException: It is not possible to migrate cluster state from version ClusterStateVersion{major=1, minor=2} to version ClusterStateVersion{major=2, minor=0}.
at com.neo4j.causalclustering.core.state.migrate.ClusterStateMigrator.init(ClusterStateMigrator.java:88) ~[neo4j-causal-clustering-5.13.0.jar:5.13.0]
at org.neo4j.kernel.lifecycle.LifeSupport$LifecycleInstance.init(LifeSupport.java:318) ~[neo4j-common-5.13.0.jar:5.13.0]
at org.neo4j.kernel.lifecycle.LifeSupport.init(LifeSupport.java:57) ~[neo4j-common-5.13.0.jar:5.13.0]
at org.neo4j.kernel.lifecycle.LifeSupport.start(LifeSupport.java:86) ~[neo4j-common-5.13.0.jar:5.13.0]
at org.neo4j.graphdb.facade.DatabaseManagementServiceFactory.startDatabaseServer(DatabaseManagementServiceFactory.java:263) ~[neo4j-5.13.0.jar:5.13.0]

While the ~/data/databases  and ~/data/transactions folders were cleared in the existing folders of the 4.4.x cluster instances, the ~/data/cluster-state folder was not cleared, resulting in the error above.

As suggested in the migration documentation, it is highly recommended to first configure a new Neo4j 5 DBMS,  whether standalone or in a cluster, after which the databases hosted on the existing Neo4j 4.4 installation can then be moved to the new Neo4j 5 DBMS.