We can download free Windows 10/7 VM (90 days) from Microsoft here,
https://developer.microsoft.com/en-us/microsoft-edge/tools/vms/
But fails to import into vCenter6.7/ESXi6.7 with ELEMENT ILLEGAL error.
I found the solution that,
Edit the ova file from here
<vssd:VirtualSystemType>vmx-09</vssd:VirtualSystemType>
To
<vssd:VirtualSystemType>vmx-10</vssd:VirtualSystemType>
Delete the following two lines,
<vmw:ExtraConfig ovf:required="false" vmw:key="nvram" vmw:value="IE8 - Win7.nvram"/>
<vmw:ExtraConfig ovf:required="false" vmw:key="virtualhw.productcompatibility" vmw:value="hosted"/>
Import ova and vmdk files would be fine but don't select mf since the ova file is modified.
