Deploying the DDM VMware appliance via the vSphere Client fails and you see this error:
The OVF package is invalid and cannot be deployed.
The following manifest file entry (line 1) is invalid: SHA256 (xxxxxxx.ova).
Resolution
Below is the link to the KB article for converting and extracting OVA files to work on older Vmware versions:
https://kb.vmware.com/s/article/2151537
vSphere Client does not support the SHA256 hashing algorithm, which is implemented in the latest DDM build.
Note. This issue presented in an old version of the Dante Domain Manager and should not affect current versions of DDM unless the interface has specifically been set to none. Please ensure that DDM is using the latest version from Software Downloads