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Download Redsn0w 0.9.6 for Windows here: http://www.mediafire.com/?c003af1yd1s5303
Download Redsn0w 0.9.6 for Mac here: http://www.mediafire.com/?qn58tna8jod2dwg

Download iOS 4.2 (also named as 4.2.1) from here:

iPhone 3g = http://www.megaupload.com/?d=G3EB4BJS
iPHone 3gS = http://www.megaupload.com/?d=P0L08E0L
iPHone 4 = http://www.megaupload.com/?d=AD8DP3I9
iPod Touch 2nd gen = http://www.megaupload.com/?d=3EW7Y9E6
iPod Touch 3rd gen = http://www.megaupload.com/?d=HV9BD7T6
iPod Touch 4th gen = http://www.megaupload.com/?d=M8X3754X
iPad 4.2 Firmware = http://www.megaupload.com/?d=RRLM4JIR