Windows 10 restore or recovery

[Windows Central Question]

OK so I was one of the insiders and had the release build on my laptop, unfortunately work laptop. Removed my dual boot partition and fell asleep during process woke up the next morning not bootable. So I changed the boot flag to appropriate partition and used a disc to fix start. Well it would seem to boot and then no gui talked to a former MS employee said that meant reinstall. So for some reason my dual boot backup wouldn't work and the only media I had was an insiders preview now I can't get back to RTM. Which is not good especially since it is an early Project Spartan browser..... Is there anyway to get back to RTM?