MT4 and MT5 are compatible with Windows 10.
Read those threads below about HowTo:
Forum on trading, automated trading systems and testing trading strategies
Frequently Asked Questions about the Signals service
20174144, 2016.04.14 18:31
Yes, it works:
MT4 NOT working on Windows 10!
Karputov Vladimir, 2015.10.01 19:50
biantoro kunarto, 2015.10.02 03:03
Windows 10 upgrade : what you should know !
Those (15002 and 15007) are "Windows Insider Program" builds and not production builds. They are like "beta" versions and still have a large number of know bugs and and other problems.
You can't possible be expecting that those problems to be resolved by MetaQuotes are you?
At least not yet, if there really is compatibility issues, the Windows versions (15002 and 15007) in question are still quite unstable and undergoing changes and corrections!
Be reasonable and realistic!