Extract "Xilinx_Vivado_SDK_2015.1_0428_1_Win64.exe" with 7-Zip in current directory
change directory to bin "cd bin"
edit xsetup.bat and remove this part
net session >nul 2>&1
if NOT %errorLevel% == 0 (
echo ERROR: Administrative permissions are not available. Please restart the command line shell as Administrator.
goto :end
)