AS it seems to be an problem used the 9901 I installed today the build 9888 on my Laptop. First time I was try, I couldn't install, so I was give it an new try today and that worked. Just the first problem were, I couldn't activate using any of the W10TP Product Keys. So, took the MKT 2.5.2, installed AutoKMS and try to activate: Nor woks, just runs more than 3 hour. So I finally got it activated using the EZActivator bottom and that worked. SLMGR /DLV shows as Partial Product Key: 9D6T9 which means that the gvlk key were used, activate till April 16. 2015. That seems to mean that the build 9888 is just an leaked build? OK, that's fine for me. Now I'm not sure I could update to the latest build when it appears maybe next week?! Anyway it's just an 'play around' with Windows 10 TP at all! Simply I'll not use the TP or even later Beta for productive use. It's just for to test that it will works with the apps my customer and my own company is using. Although important is that Windows To Go will works correctly. For the later I'll use WinToUSB for to create those Workspace Drives because of the time I would save for no need to install avary needed apps several times, once on each W2Go drive! The already installed 9901 on an W2Go drive I tested on more than 20 different computers and it works on all very well. Not any problem with activation, in fact, I was nor need to do any single activation on those USB Drives, I used 3 for the time being. The activation were taken over from the Master Machine (my Laptop(!) which runs now with 9888! OK, on the 9888 build, I couldn't also not use my HP WiFi Mobile Mouse. The driver will not work with W10TP at all. Works fine with any Windows 8/8.1! Next what isn't work is the Update for X-Plane 10 and I get also problems with Condor Soaring Simulator. Let waiting a few day and see what happen with the new build. Will have re-install anything again!