Check the official AMD Support Community under "Legacy Products" or search the /r/FPGA subreddit for "ISE 14.7 modern OS." Disclaimer: This post is for informational purposes. Always download software directly from the official AMD/Xilinx website to avoid malware.
How to Download Xilinx ISE (Legacy Versions): A Step-by-Step Guide xilinx ise download
Do not attempt to use ISE for Artix-7, Kintex-7, Virtex-7, or Zynq devices. Those require Vivado (free standard edition available). ISE will not recognize these chips. Check the official AMD Support Community under "Legacy
Navigate to the official AMD (formerly Xilinx) support site: https://www.xilinx.com/support/download.html xilinx ise download