Upgrading to MacOS from 10.6.8 MacBook Pro I have 2011 MacBook Pro that I have not used for a while. Now I am back to using it and would like to upgrade to the latest OS available. Currently, it is 10.6.8 an here are the issues 


When I try to download the MacOS High Sierra from the App store, the "Get" button is grey and nothing happens when I click it. In fact, all the apps are like this and I cannot use the App store to download anything at all (I have signed it with my Apple ID).
Cmd+R at the booting is not working so I cannot even restore to factory settings.
I do not have recovery disks.


Could you please help me to sort this out as I am not familiar with Mac that much.
Are you using a 32-bit machine?

Unfortunately, 32-bit systems cannot run any OS after Snow Leopard (10.6). You have a few options:


Keep using Snow Leopard (be extremely careful about security, as I don't think it's still receiving updates)
Buy a newer Mac (possibly used)
Install Ubuntu and use it instead of OS X


If your machine is 64-bit, then I don't know what the problem is.