We are changing the product keys that are used in the Insider Preview, beginning with Build 10158.
If you do a build-to-build upgrade through Windows Update, we were not expecting anyone would need to enter a product key.But if you are prompted for a product key on Build 10158 or a later build, the new keys are:
For Windows 10 Insider Preview Home Editions: KTNPV-KTRK4-3RRR8-39X6W-W44T3
For Windows 10 Insider Preview Pro Editions: 8N67H-M3CY9-QT7C4-2TR7M-TXYCV
For Windows 10 Insider Preview Enterprise Editions: CKFK9-QNGF2-D34FM-99QX2-8XC4K
ISO files only become available once a build is released to the Slow setting.So the product key listed on the ISO download page at this time is still for Build 10130.Once Build 10158 is released to the Slow setting and the new ISO files become available, the product keys listed on the download page will be updated.
It should also be noted that beginning in Build 10158, clean installs of Windows 10 Insider Preview
will prompt you to enter the appropriate product key during setup to activate Windows.