SDK Import — Strix Unity SDK User's Guide
Unity won't let me import packages anymore. - Unity Answers
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Unity - Manual: Asset Packages
Unity - Manual: Asset packages
I can't import Unity Packages, only custom ones. Can someone please help me, thanks. : r/Unity2D
For some reason, when importing a package, Unity wants to update files in another package. - Unity Answers
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Unity - Manual: Import the Downloaded Package (SDK)
Unity - Manual: Import SDK
Wikitude SDK Unity 1.1.0 Documentation
