@AHib When I installed AutoCAD 2025.1 a few weeks ago, it broke Civil 3D British English and after a few clean uninstalls and reinstalls, it still didn't work but interestingly the standard US English version of Civil 2025 installed and ran with no problem.
I updated Revit to the latest version and it failed to run as .NET 8 wasn't installed (!!). I installed .NET8 and Revit worked and then I reinstalled Civil 2025 British English and it worked as expected again.
Whether this .NET8 issue affected the original install of Civil or not I have no idea but that would be my conclusion
neilyj (No connection with Autodesk other than using the products in the real world)
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AEC Collection 2025 UKIE (mainly Civil 3D UKIE and IW)
Win 11 Pro x64, 1Tb Primary SSD, 1Tb Secondary SSD
64Gb RAM Intel(R) Xeon(R) W-11855M CPU @ 3.2GHz
NVIDIA RTX A5000 16Gb, Dual 27" Monitor, Dell Inspiron 7760