https://xilinx-ax-dl.entitlenow.com/dl/ul/2018/12/08/R210093553/Xilinx_Vivado_SDK_2018.3_1207_2324.tar.gz/2d4db8f59660b2d6fc4bba2469ea81c1/5C1152B4?akdm=0&filename=Xilinx_Vivado_SDK_2018.3_1207_2324.tar.gz
Download link for 2018.3. Wish some expert can download and upload to the FTP.