insufficient space while updating WhatsApp and other apps Whatsapp has forced everyone to update their apps before June 8th. Everytime, I tried to update it I got the 'insufficient storage space' error and now, on June 8th, I can't access my Whatsapp. As of now, I have:


2.43 GB available on internal card
5.69 GB available on SD Card


I have rooted Sony Xperia SP running on Android 4.3. 
I have tried every possible thing on the Internet. The problem is Google Play Store is allowing me to install some apps but giving error on other apps installation/update. I was successfully able to download Sound Cloud and Clean Master, but couldn't update Whatsapp or install System Cleanup. I even tried to download System Cleanup manually through apk file but it gave me the same error. I think my solution is somewhat mentioned by these two people here:
insufficient space while updating WhatsApp on CyanogenMod

However, the problem is I can't download System Clean up and I don't know how to manually delete dead folders

Update
This is how far I have come:


I can see all the contents of /data and /data/data
I even deleted some whatsapp related files that I don't remember. They neither did any good nor harm the phone. 
I have read that I have to delete 'dead data folders' and 'affected libraries'. However, I have no idea exactly what to delete or how to know which libraries are affected!
Try clearing 'cache' through stock recovery or any appropiate apps and reboot your phone.

If the same problem presist, then try clearing google play store app cache and try clear data.