Hi Roman, Someone used virt-v2v to convert a Windows 2016 guest, and then tried updating it to a later version (tried 2019 & 2022), and the update doesn't work. https://issues.redhat.com/browse/MTV-2256 After some investigation it seems it might be due to this change from nearly 10 years ago: https://github.com/libguestfs/virt-v2v/commit/d56170211c427740e174b96e727414... Have you seen this kind of thing happening? This is the first time I've heard of it happening, which is quite unusual as the change was done so long ago. Rich. -- Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones Read my programming and virtualization blog: http://rwmj.wordpress.com libguestfs lets you edit virtual machines. Supports shell scripting, bindings from many languages. http://libguestfs.org