Can't add preview Package

Questions & Answers
1

I can not enable Preview packages, because there is no option for it in the manu anymore… I also can not install a preview package, even when I can find it, because the install Button is greyed out.

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171019-unity-packagemanager.png
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2

Try:

PackageManager / + icon / Add package from git URL / enter package name ther, example:com.unity.entities / click Add (and wait few seconds)

List of available preview packages for given unity version:

https://docs.unity3d.com/Manual/pack-preview.html

note: list differs between unity version (doc version switch is upper left corner)

3

I got it to work by basically just enable previewPackages in PackageManager and ROLOADING after that. To reload you basiccally just have to press the reload button at the bottom center of the PackageManager