The Corporate VP of Operating Systems went on the reveal that a cautious 36% of users have installed the OS on virtual machines.and as you know Windows 10 Technical Preview is still early stage, and is recommended for PC experts and IT pros only.
Today Microsoft has launched the first update for windows 10 technical preview "kb3000061" and this patch update bring :
Adds capabilities to determine application compatibility problems and effects.
Addresses an issue in which an application such as Microsoft Word or Microsoft PowerPoint seems to freeze when you open a document that contains a large EMF file. After you install this security update, you can stop the application without waiting for win32k.sys to finish processing the EMF file.
So if you want to download it you just need to go to windows update from control panel and check for new updates.