Hi Zhao,
Please use the title of the post for a short description and place your question inside the body of the message.
To manage your code, I would recommend to use some code revision tool (mercurial, git)
There are two HOW-TOs for them
Then updating to later version and porting your modifications should be more straight forward.
Regards,
K
On Friday, September 16, 2016 at 9:18:45 AM UTC+1, zhao yang wrote: