* Clarifying OSX, adding issue with Install-Package
- Changing first section to "non-Windows" and clarifying that most of these issues apply to both Linux & OSX.
- Fixed a few typos.
- Adding known issue with Install-Package per #1773
* Mac OSX -> macOS
Complying with convention used in #1934
* added alpha build # to install-package notice
* typo
* Typo
