From the 2022.1 version, Pixyz Plugin will be installed only from Package Manager.
Pixyz Plugin 2022.1 rX you should have 3 .tgz files:
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⚠️ If Pixyz Plugin was already installed, delete it from the project before installing the new one. To do so:
If installed by .unitypackage :
/Assets/PluginsIf installed from Package Manager: Remove the package from Package Manager
</aside>
Open the Package Manager
With the + choose Add package from tarball…

In the order, install each package:
You can use Pixyz Plugin 2022.1