1. Download and launch Fiddler (http://www.telerik.com/fiddler) on your computer. 2. Click the Tools menu and select Fiddler Options. 3. Select HTTPS tab at the top, and put a check mark on “Decrypt HTTPS traffic” and follow it up by clicking Yes if a popup appears reading “Scary Text Ahead!”. 4. Click the Actions button and select Export Root Certificate to Desktop. You will be notified that the “FiddlerRoot.cer” certificate file has been exported to the desktop. Click OK, and then OK again to get back to the main Fiddler interface. 5. Without exiting Fiddler, locate the exported certificate file on your Desktop and right click on it and then click Install Certificate. Now click Next followed by selecting Place all certificates in the following store, and clicking on the Browse button. 6. From the resultant certificate store list, select Trusted Root Certification Authoritiesand click OK. 7. Once the location is set, click Next and hit the Finish button.
8. Now launch iTunes, and make sure you’re signed in with your Apple ID 9. Search “WhatsApp” 10. Open Fiddler > click “Rules” > “Automatic Breakpoints” > “Before Requests” 11. Go back to iTunes > download WhatsApp 12. Go back to Fiddler > on the left panel, highlight “p6-buy.iTunes…..” > click green button “Run to Completion”, a new “p6-but.iTunes…..” will appear underneath, highlight it 13. Click “Raw” tab on the right panel 14. Under “<key>appExtVrsId</key>”, change the “<string>816309281</string>” to “<string>815681537</string>” 15. Click “Rules” > “Automatic Breakpoints” > “Disabled” 16. Highlight “p6-buy.iTunes….” again, click “Run to Completion” 17. Done, older version WhatsApp should now start downloading in iTunes, sync it to your iPhone. 18. Remember to disable auto update in iPhone
