did all that. Clean hosts file. Signed in and out. Nothing is working.
in order to get lightroom to launch i had to click start trial. but its not a trial version. I even checked on my plan and payments on the site and its all up to date.
I think the best option would be to contact support regarding this as they can even remote into your machine to check the reason . https://helpx.adobe.com/contact.html
Let us know in case of any issue.