I recently virtualized a Windows 10 20H2 disk that had been set up as a GPT disk with an UEFI partition.  After virtualizatzing the disk, i followed an EXCELLENT article that was able to change the GPT disk to a BIOS booting disk  WITH NO DATA LOSS here: https://infra.engineer/windows/68-windows-server-convert-uefi-to-bios-without-data-loss-for-free

The only problem I am having now is that I cannot add a NIC to the machine when the machine is on; it results in a error that says

Cannot assign a PCI slot to 'ethernet0'. There are no more hot-pluggable PCI slots available in the virtual machine. Remove some devices from the virtual machine configuration and try again.

The above error is then followed by a second error that says

Device 'ethernet0' could not be hot-added.  No free hot-pluggable PCI(e) slot is available.

I know that there is a misconfiguration in the VMX file and I have made different attempts to fix it without success.  I have zipped both the VMX file and the error log.  Can anyone take a look or help resolve the error?  Many thanks in advance.