When you try to install SDK, if you get these following messages.
First, try to install SDK as administrator.
Additionally, please do following guides about turning off UAC.
NOTE : Please understand that this method lowers the computer's security level, leaving the computer vulnerable to risks.
1.Write down ‘UAC’ into the Windows Search bar.
2. Click "Change User Account Control settings.“
3. Change the slider down to "Never Notify.“
4. Click OK and then restart the computer.