URGENT : DocType not showing "Form Tab" to edit layout


I was able to install Frappe on AWS EC2 instance but When I create a new DocType or View an old doctype Form Tab through which we can arrange/edit layout is not being displayed(Image Attached).

Can anyone share his/her wisdom for this ??

Perhaps you were using nightly branch. This feature will be part of upcoming v15, it’s not there on stable branches.

Thanks @ankush !!
But how can I get the same version on my AWS instance.
I am totally new to this framework.
Can you help me out a bit more?