Civil 3D 2025 to 2026 Update

[Domzinator]

Hi all, we are moving over to Civil 3D 2026 and i am having issues getting the Plugin to load now in Civil 3D 2026.

I have Deleted all my Plugin References to 2025 and reimported the 2026 References and have also changed this:

<RuntimeRequirements
SupportPath="./Contents/Support"
OS="Win64"
SeriesMin="R25.0"
SeriesMax="R26.0"
Platform="Civil3D" />

i have also tried R25.1 at both and still doesnt want to load .Dll's.

Am i missing something for 2026? 

[hippe013]

Is your Target Framework set to .NET 8.0? 

[Jeff_M · Accepted solution]

Where is your .bundle located? If you have it in the ProgramData folder, AutoCAD 2026+ will no longer load from there. I relocated my bundles to here: C:\Program Files (x86)\Autodesk\ApplicationPlugins 

They may also be placed here: C:\Users\<USERNAME>\AppData\Roaming\Autodesk\ApplicationPlugins

[michal_hcz]

	<Components Description="C3D 2025">
		<RuntimeRequirements SupportPath="./Contents/Resources" OS="Win64" Platform="Civil3D" SeriesMin="R25.0" SeriesMax="R25.0" />
		<ComponentEntry AppName="Tools" Version="1.0.0" ModuleName="./Contents/2025/Tools.dll" LoadOnAutoCADStartup="True" />
	</Components>
	<Components Description="C3D 2026">
		<RuntimeRequirements SupportPath="./Contents/Resources" OS="Win64" Platform="Civil3D" SeriesMin="R25.1" SeriesMax="R25.1" />
		<ComponentEntry AppName="Tools" Version="1.0.0" ModuleName="./Contents/2026/Tools.dll" LoadOnAutoCADStartup="True" />
	</Components>

But as Jeff mentioned. Since Civil 2026 there has been an important change with plugin automatic loading.
In 2025- it works from path c:\ProgramData\Autodesk\ApplicationPlugins\

But in 2026+ plugins have to be inside c:\Users\user\AppData\Roaming\Autodesk\ApplicationPlugins\ or even better in c:\Program Files\Autodesk\ApplicationPlugins\

There is also a way to use the old ApplicationPlugins folder but u have to change something in windows registers...

M.

[Domzinator · Accepted solution]

Thanks this solved it, i want aware it was moved thanks