1. Why can’t I download Skyleader 2.0 from the website?

Skyleader 2.0 is not allowed to download or run in FireWall settings. If you have a FireWall installed, please check that Skyleader 2.0 has appropriate access rights.

2. How to determine which version of software should I install?

Skyleader 2.0 has win 32 and win 64 version. Please install the software based on your windows version. If you do not know your windows version, please follow the steps below.

Click “Start” → Right click “Computer” → Click “Properties”. Find "System Type" and note whether your operating system is 32-bit or 64-bit.

Click “Start” → Click “Setting” → Click “System” → Click “About”. The Version and System type are shown on the About screen.

3. Why can’t I install Skyleader 2.0 in MAC ?

Skyleader 2.0 is downloaded from the official website, not from Mac App Store, so you will have to change the settings through System Preferences.

Please refer to the link:
How to install software from unsigned developers on a Mac.