1. I upgraded to 4.5 in CIC
2. all third party apps disabled
3. In market place there is no option to download  : It says install from admin panel
4. In admin panel  - on clicking upgrade  >   it says upload file  - but above point 3 says you cannot download 

IPS support says - ask third party developers 

I need the process so i can upgrade

 

@Saurabh Jain from ACP you've to go down to last icon you will find "marketplace" login using your IPS email address and password, and then you can update your application and plugins.

First you need to match your installed third-party resources to the Marketplace. Click on this notifications. 

After that everything is very easy. If there are new versions, you get a notifications and you can upgrade with a single click. 

@Saurabh Jain there is also a known issue where available updates will not appear immediately depending on the number of things you have installed from marketplace. You may need to go to ACP > Settings > Applications and click the "Check for updates" a number of times before available updates appear (we had to click it 8-9 times in testing for our installs). Once they're available, you'll see the counter on the application/plugin area increment and show that updates are available, and a link next to the application/plugin that says "Upgrade" which you can click to begin the upgrade process.

We don't use themes from the marketplace, so I'm not sure if the same applies there.