Not able to sign in to upgrade my nik software

I have been a user of Nik software since March 2013. I am trying to upgrade my Nik software 2 to a nik software 4, I am having problem login in. Could someone please assist me with an address to Nik so that I can login to my account to upgrade.
ontact Nik colletion

Welcome, Remi.

You can log a support request here.

Or, since it sounds like you have a DxO account, you can log-in to it here - and check-out your status.

John M