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Hi,
I wont be able to update my Z3 Dual to the new software update, I keep getting one of these errors:
- "Cant Download Mobile Software, please check internet connectivity". I am sure my internet connectivity is on and I get this alert when the download reaches to 97% of completion 
- An error and PC companion asks me to download Sony Update Service Engine, and when I download it, Windows stops installing it giving a red alert that the sertificate of the installed program is corrupt 
What should I do? I dont prefer to download the software from a different source then flash it. this means to re-install all apps once again and start from Zero !!!
Thanks
Solved! Go to Solution.
What operating system are you running as Windows 8/8.1 or a 64bit system can and often will cause a similar issue if not the same and to get around this you need to run PCC in compatibility mode
I have windows 7..
how do i run PCC in compatibility mode?
Normally right click the icon then select Troubleshoot compatibility or right click the icon again but then select Properties then the Compatibility tab - The issue is the Flashmode driver which can be a pain with those listed operating systems
will try and let you know if worked. thanks 
Did not work.. this is what I get
Unable to install software update components on your computer
Sony Update Engine could not be installed (error 0x80070002)
Install Sony Update Engine manually by clicking this link, and follow the instructions.
When i click on the link, Sony update engine gets downloaded, but it does not get installed as I get this error in red color "The signature of thie program is corrupt or invalid".
so is this a problem in my PC or a problem in Sony files or apps?
It seems like a problem with your PC, what if you re-download PCC > reboot on safemode > run PCC and check again
will try in safe mode and let you know.. I dont guess it is in my PC as i tried in a different laptop and got same error.. but will see if safemode works...
Just checked that error code with M/S and it could be an error caused by a .net framework update and the ability to certify or authenticate certificates - This is not an Android issue and can also be seen with M/S updates - If it helps
safe mode did not work, as it starts windows with core drivers.. this means that PC will not recognize the mobile drivers when connected to USB. So PC Companion did not connect to the mobile.
Let me try look for updates to my Windows. this might help.
my windows is up to date.. still cannot update due to same errors. nothing wrong with my laptop 
I guess it is a problem with the download file from Sony !!!