Cannot run earlier versions of ETL Development after installing ETL 4.9

[CR #535684] You cannot run ETL 4.9 concurrently with earlier versions of ETL Development due to registry and resource conflicts. If you have an earlier version of ETL Development installed on your machine, then installing ETL 4.9 on the same machine will prevent the earlier version from starting or connecting with the Demo data sources.

Workaround: To continue using the earlier version of ETL Development, do not install ETL 4.9 on the same machine that has the earlier versions of ETL installed.