MT4, MT5 is not compatible with the latest version of win10 (win10 build 15002, win10 build 15007)

 
Such as:

MT4 in the latest version of win10 can not  be open;

MT5 in the latest version of win10 can be open, but can not load custom indicators.
 

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

is mt4 installable on windows 10?

Yes, it works:

MT4 NOT working on Windows 10!

Karputov Vladimir, 2015.10.01 19:50

...MetaTrader 4 and MetaTrader 5 work perfectly...

Forum on trading, automated trading systems and testing trading strategies

MT4 NOT working on Windows 10!

biantoro kunarto, 2015.10.02 03:03

I am using Windows 10 and there is no problem with MT4 and MT5.

There are some threads which may be good to read before upgrading to Windows 10 for example:

Windows 10 upgrade : what you should know !

Windows 10

 
Yu Zhang: Such as: MT4 in the latest version of win10 can not  be open; MT5 in the latest version of win10 can be open, but can not load custom indicators.

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!