This release includes the tooling to support an in-place upgrade of ASEA to LZA. There are no functional changes to ASEA between version v1.5.11 and v1.6.0 other than those needed to support the upgrade.
The documentation for the ASEA to LZA upgrade is available in the AWS Secure Environment Accelerator guide on GitHub pages and the upgrade tools are available in the reference-artifacts/Custom-Scripts/lza-upgrade folder of this repository.