5.7.15_240411 is what you want from that page. It's not the latest but is the last version which will allow you to do a VCA search/smart search for non Human/Vehicle events if you've used the Human/Vehicle filter in your event setup (plenty of information regarding this elsewhere on the forum but basically Smart Search is where you draw a line/box on the playback screen and search for what's crossed it/entered it). All versions after that will display no results if you do that search. If you never need to search video for something other than human it's a non issue and you can get the latest version (5.7.19_241207) directly from the Resources link on the page for your model on the Hikvision website. The portal is no longer the place to get the latest firmware and is really only useful if you need previous versions because you have a camera or NVR that is years out of date and needs to be updated in stages.