4) The updates are available for 1 year with a valid license. After this time period expires, you can request another free updated license.
Yeah, we've all seen this game. "oh, you want to extend your license. We would like to inform you that one of our top managers has developed a bad itch in his private parts, and as a result he decided to change license conditions, and now you need to sign away your kidney to us in order to extend the license. Oh, and by the way the free license now only allows you to run a synthesis, so you've got to pay $OMG in order to actually create a bitstream".
Sorry, but more and more people don't buy this BS anymore. Of all FPGA vendors Xilinx/AMD has the best licensing scheme, when you can export your license into a file and use it till the rest of times even if entire Xilinx/AMD company vanishes into the ether tomorrow. I for one will never even consider using such "free" software for anything important. And neither should you!