Steps to reproduce :

- open Asset Store
- import the Playmaker package https://www.assetstore.unity3d.com/en/#!/content/368 and notice the errors
- try to open the Playmaker Window and notice it's not shown in the toolbar

error CS1704: An assembly with the same name `PlayMakerEditorResources.resources' has already been imported. Consider removing one of the references or sign the assembly
Assets/PlayMaker/Editor/de/PlayMakerEditor.de.resources.dll (Location of the symbol related to previous error)
Assets/PlayMaker/Editor/es-ES/PlayMakerEditor.es-ES.resources.dll (Location of the symbol related to previous error)
error CS1704: An assembly with the same name `PlayMakerEditorResources.resources' has already been imported. Consider removing one of the references or sign the assembly
Assets/PlayMaker/Editor/de/PlayMakerEditor.de.resources.dll (Location of the symbol related to previous error)
Assets/PlayMaker/Editor/fr/PlayMakerEditor.fr.resources.dll (Location of the symbol related to previous error)
error CS1704: An assembly with the same name `PlayMakerEditorResources.resources' has already been imported. Consider removing one of the references or sign the assembly
Assets/PlayMaker/Editor/de/PlayMakerEditor.de.resources.dll (Location of the symbol related to previous error)
Assets/PlayMaker/Editor/it/PlayMakerEditor.it.resources.dll (Location of the symbol related to previous error)
error CS1704: An assembly with the same name `PlayMakerEditorResources.resources' has already been imported. Consider removing one of the references or sign the assembly
Assets/PlayMaker/Editor/de/PlayMakerEditor.de.resources.dll (Location of the symbol related to previous error)
Assets/PlayMaker/Editor/ja/PlayMakerEditor.ja.resources.dll (Location of the symbol related to previous error)
error CS1704: An assembly with the same name `PlayMakerEditorResources.resources' has already been imported. Consider removing one of the references or sign the assembly
Assets/PlayMaker/Editor/de/PlayMakerEditor.de.resources.dll (Location of the symbol related to previous error)
Assets/PlayMaker/Editor/nl/PlayMakerEditor.nl.resources.dll (Location of the symbol related to previous error)
error CS1704: An assembly with the same name `PlayMakerEditorResources.resources' has already been imported. Consider removing one of the references or sign the assembly
Assets/PlayMaker/Editor/de/PlayMakerEditor.de.resources.dll (Location of the symbol related to previous error)
Assets/PlayMaker/Editor/pt-BR/PlayMakerEditor.pt-BR.resources.dll (Location of the symbol related to previous error)
error CS1704: An assembly with the same name `PlayMakerEditorResources.resources' has already been imported. Consider removing one of the references or sign the assembly
Assets/PlayMaker/Editor/de/PlayMakerEditor.de.resources.dll (Location of the symbol related to previous error)
Assets/PlayMaker/Editor/sv-SE/PlayMakerEditor.sv-SE.resources.dll (Location of the symbol related to previous error)
error CS1704: An assembly with the same name `PlayMakerEditorResources.resources' has already been imported. Consider removing one of the references or sign the assembly
Assets/PlayMaker/Editor/de/PlayMakerEditor.de.resources.dll (Location of the symbol related to previous error)
Assets/PlayMaker/Editor/zh-CN/PlayMakerEditor.zh-CN.resources.dll (Location of the symbol related to previous error)
error CS1704: An assembly with the same name `PlayMakerEditorResources.resources' has already been imported. Consider removing one of the references or sign the assembly
Assets/PlayMaker/Editor/de/PlayMakerEditor.de.resources.dll (Location of the symbol related to previous error)
Assets/PlayMaker/Editor/zh-TW/PlayMakerEditor.zh-TW.resources.dll (Location of the symbol related to previous error)

Compilation failed: 9 error(s), 0 warnings

*Note:
Tried in 2017.1 and still the same error.
This package used to work before.