13 Win does not install in case ...

[6equj5]

.. you have no "C:". Try just the installer service, it won't start. Somewhere the "C:" is hard coded. @Veeam ... really ... in 2025?

My WS2K25 runs as "F:" for ages (10+ years?). Can't even remember why, probably because of some weird dual boot back then. Anyway it made each and every in-place upgrade from ... dunno, maybe WS2K8R2 onwards. And it made every major Veeam upgrade, although I had to

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net use c: \\localhost\f$

during installation only. This time it was way harder to find a solution. Finally I put

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Windows Registry Editor Version 5.00

[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Session Manager\DOS Devices]
"C:"="\\DosDevices\\F:\\"

into registry. This is some kind of a permament "subst". Maybe I´ll remove it for fun but I guess it'll break 13 completely.

[Dima P.]

Hello 6equj5,

Thank you for your feedback we will share it with RnD team!