How do I open a .tbulic11 file using Passolo 2016 Professional Edition?

I am new in SDL Passolo.

I have a project which is in .tbulic11 format.

I want to open that in SDL Passolo 2016 Professional Edition 

But It is opening in read-only mode means I can not do any changes in that.

It gives following warning:

" Project_Name.tbulic11 contains data in format of SDL Passolo 2011. Opening in read-only mode. "

Please help.