I am currently using 2017.1 and learnt that 2017.2 is available. Is there any link or something from where I can upgrade.
There is no 2017.2 version. There is an update to the initial 2017.1 release, called 2017.1 SP1. If you are using CE it updates automatically and the latest official version of UiPath is 2017.1.6522.