Microsoft today opened the door to its Windows Insider Program, letting adventurous customers download an early, unpolished preview of Windows 10.

Windows 10, which Microsoft labeled as a Technical Preview, comes in the form of an .iso file that ranges in size from 2.9GB to 4GB, depending on the language chosen. Both 32- and 64-bit versions are available, but only in English, Chinese and Portuguese editions.

Microsoft introduced Windows 10 on Tuesday at an hour-long news conference, where a pair of the company’s executives highlighted some of the changes from Windows 8 and touted its usefulness to enterprise customers.

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