Yesterday, Microsoft released Windows 10 Technical Preview Build 10049 to Fast Ring users Windows Insiders. Microsoft announced that they are not releasing ISOs for Windows 10 Build 10049 during Fast Ring release cadence. users need to update through Windows update. Microsoft will release ISOs when they release the build for Slow Ring users.
With the images downloaded from Windows update server, WinAero has created an ISO. You can download this ISO using a torrent client and install it on your PC. File size comes around 3GB.