if you have account with same broker then you can use either Now or Nest, whichever has been enabled by broker. if at present u r using Now then you will have to request broker to transfer to NEST.
NOW is much better than ZT so cannot switch ... If anyone has an empty account that they wont be using for sometime, that can help.
Edit - Meanwhile, boarders - Set Nest title in OrderMan.ahk in below variable. And check if you are getting any problems - Usually it might hang and timeout because some window control name is not correct.
TITLE_NOW := "NOW 1.13"