Ok. Here is what happened, this might be useful to some of you. When I upgraded RC to v6.5.0, it automatically added a premium key to my existing site with 30 days trial which allows only 20 users. I freacked out After I saw that.. But, after I removed the key from the settings, then I got back to the Community version.. 😎 I guess it is one of their marketing strategy to get people off the Community free version.. Cheers.