I think you are out of luck, I don;t think you can download it from anywhere else.
2010-3-8 Microsoft Remote Desktop 是一款Mac上微软官方出品的远程桌面工具,今天和大家分享最新的 10.3.8 版本,可用于连接Windows系统的电脑和服务器,支持最新的Windows 10系统,简单易用,且速度很快,很不错的一款远程桌面工具!. Microsoft Remote Desktop 8.0.43 - General bug fixes Microsoft Remote Desktop 8.0.42 - Fixed an issue with remote resources where pop-up dialogs were hidden behind other windows, instead of appearing in front Microsoft Remote Desktop 8.0.41 - Fixed an issue that caused apps to appear distorted when you used remote resources Microsoft Remote.
Maybe also look into http://cord.sourceforge.net
Why don't you try downloading it on your computer and see if you can extract the file from the download? Right-click and show package content.
PS: Is that: https://www.microsoft.com/en-us/download/details.aspx?id=465 the right client?
I can't test it since I don't have a MAC at work.
or this one: https://www.microsoft.com/en-us/download/details.aspx?id=18140
Edited Apr 21, 2015 at 22:53 UTC