I too have installed Windows 10 and FTM2014 has not had any problems.
For some reason, Microsoft gave me Windows 10 on Tuesday, the 28th. While I had not participated in the Windows 10 Preview, I had reserved a copy. Also, I had kept Windows 8.1 up to date including all optional updates. I just happened to notice that all day Tuesday, my computer was trying to update but was failing at every attempt. I found an article that gave the name of the folder where Microsoft had been downloading files. I checked my computer and found that Microsoft had been downloading files to my computer since the date of my reservation. Then Tuesday evening, I received the notice that it was available so I upgraded.