On the 2019.1 archive page, you will see several options under the heading
Depending on your internet stability and disk space, choose one of the following: xilinx vivado 20191 download hot
Based on your search for , it is highly likely that you are encountering issues with the official Xilinx downloaders, or the official archive links have moved. On the 2019
Vivado 2019.1 Update 3 (2019.1.3) Release Notes and Known Issues On the 2019.1 archive page
A: No. Always use the official AMD/Xilinx archive. It is 100% free for WebPACK devices (most Artix/Zynq). Downloading from random "hot" mirrors risks malware that can brick your $10,000 FPGA board.