To run SW2015 in Windows 10, I'd like to try the SP5 Early Visibility, as was recommended by support and advertised on Technical Alerts & News.​ Following the download link, I would select version 2015, only to find SP1-4 and no mention of SP5 EV.

Is there any chance to try this NOW? I'm a bit hesitant to give several machines a fresh install of Windows 8.1 that will take a whole day including setup and upgrades, only to upgrade back to Windows 10 on wednesday when SP5 comes out.