There is no upgrade path to VMware BMA 3.1. This is due to some major internal architecture change. The workaround is to:
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Do a fresh installation of VMware BMA 3.1.
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Export the workflows developed in your current VMware BMA version (VMware BMA 2.0 or 3.0) and import those workflows to VMware BMA 3.1
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Manually backport any specific configurations done in the previous version to VMware BMA 3.1.