I have downloaded the FMS from the FileMaker Developer Subscriber section (fms_18.104.22.1688.dmg). But when I open the dmg I get a checksum failure. I tried the download with two different computer (MacBook, MacMini) with two different browsers (FireFox, Safari), always with the same disappointing result.
Similar to post FileMaker 15 Trial does not work on Mac OS Sierra
I hope you can fix this soon.