the newest build won"t appear on the itch app cause they were not tagged with the OS they are for.
To get around this on windows, go to your downloads folder after you got it from the itch website and double-click on it. Do it again and then one last time on the actual FBtW application. It will ask you what you want to do; choose 'extract all' and then 'extract.' After it's done, go back to your downloads folder and do the same clicks on the new, unzipped folder. Windows incorrectly marks some Renpy versions as malicious, if this happens, click on the 'more info' option and then 'run anyways' Have fun!! this is the same for pretty much any VN on here so yeah