[Bug]: Missing IMPORTANT UNITY DLLs in 2019.2.13f1 (and possibly other versions)

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Are you on the latest version of AssetRipper?

No, I need to download a newer version and try again.

Which release are you using?

Unselected

Which game did this occur on?

Milkman Karlson by Dani (x64 version)
https://danidev.itch.io/milkmankarlson

Which Unity version did this occur on?

2019.2.13f1

Is the game Mono or IL2Cpp?

Unknown

Describe the issue.

A bunch of BUILT-IN unity namespaces are missing when I decompiled Milkman Karlson by Dani. I'm pretty sure it's just flat-out missing some Unity built-in dlls.

I'm not sure how to tell if it's Mono or IL2Cpp, but you can download the game here if you want to test it yourself:
https://danidev.itch.io/milkmankarlson

Relevant log output

AssetRipper.log

[github-actions]

Thank you for submitting your first issue here. Please be sure you have uploaded your AssetRipper.log file. It is in the same folder as the exe file. :)

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UPDATE: Turns out I just had to download the Unity UI package with package manager. Apologies!