Change log
- Fixed compile error on 2018.2
- Don't close the window after finishing uploading the package
- Added namespace "AssetStoreTools" to all source files
- executed code cleanup on each file (using VS 2019 cleanup tool)
- fixed DivideByZeroException in AssetStoreClient
- suppressed warnings for never assigned variables in AssetStoreManager
Tested on Unity 5.6.6f2, 2017.3.1f1, 2018.1.0f2 and 2019.1.0f2.