Good morning,
I'm getting the above error [Not a supported disk format (sparse VMDK version too old)] when loading a VMDK created using libguestfs and converted to VMDK format using VBoxManage convertfromraw, with an OVF file that has worked in the past.
When the VMDK is loaded without any OVF file (and a relatively sane, default hardware specification is chosen), it loads and boots correctly, suggesting that there's a problem with the OVF file.
How can I tackle this problem?