[How to open key file .btkey]

I can't activate my recent purchase of uTorrent Pro for Windows without supplying the product key.   The key  has been supplied to me in a file called .btkey but I'm not finding an app to read the contents.  I tried three different apps from the Microsoft store but none are able to read the contents.  Can someone help me with what I need to do to get my key?

[getting uTorrent in new computer with pro]

I thought I almost got an installation from Cleverbridge.  But it wouldn't start to open for a download and stopped.  In the lower right corner of my display a message appeared saying a virus was stopped.  On the second try for a download there was the same report of a virus.  The program making the virus report was MacAfee  that came with the new computer.  I don't need this program because I have my own virus program - so I uninstalled it.   But unfortunately there was a reboot of my computer to finish the job and I lost my intended download setup.  I paid for the uTorrent Pro (checked with my credit card),  and now I'm not finding a way to contact them for another download - no email address, no phone number on their website.  Does anyone have a address/phone number?