after creating avatar it gives download link instead of connecting to vrchat or other places
I´m guessing you entered the avatar creator through Ready Player Me´s home page. If you go to VRChat.com, click Creators/Get an Avatar, it will take you to a similar Readyplayer.me editor that will give you an option to import to VRChat once you finalize your avatar.
This worked for me up until about 3 weeks ago. I´m guessing there´s been an upgrade to VRC that has temporarily disabled the upload feature. Hopefully, it will be corrected soon.