As of Anthos on VMware version 1.9, the documentation states that a demonstration installation is possible using a single ESXi host with 8 CPUs, 40GB RAM and 450GB of storage.
vSphere is also currently a requirement at this version.
You're using the wrong tool. You cannot serve beer with a fork.
VMware OVF Tool is a command-line utility that allows you to import and export OVF packages to and from many VMware products.
To check whether a VM with the name myVM exists you should try PowerCLI:
Get-VM -Name myVM
I'm not quite understanding the conundrum. If you delete the snapshots they will all be merged into the parent disk and all of the changes in the snapshots will be preserved. Why is this not a solution?
VMware virtual disks cannot be extended if they have snapshots.
Archive what you need to preserve to a real backup system. Beware some backup systems will not preserve snapshots, consider copying files direct from the hypervisor. Test restore by creating a new VM from this backup.
Delete the snapshots.