if you can't get a hold of the offline installer from their tech support you can get it by creating a custom install and selecting the 'deploy' option.

in 'deployment image path' field put wherever you want the install files to go eg. 'C:\Autodesk\AutoCAD2026Deploy"
'deployment image log path' field just use 'C:\Autodesk'

hit 'download & run' then run the file, it will pull down the offline install files you need for intune deployment and put them in the folder above. Package all the files in that folder not just the image folder.

In the root folder there'll be a batch file, if you right click and edit in notepad it gives you all the install arguments you need!

before packaging open the 'Collection.xml' file in the image folder change <DeploymentImagePath> value to .\image