In 12 days. This is the 11-Nov-2017. This question has been asked repeatedly in this forum. Always with the same date. And the serial number is the same 161XXX also.
Now you get the clear instructions in the message already:
License #XXXXXX is no longer eligible to be used on your computer. You should
deactivate immediately. This process deactivates all releases of license
#XXXXXX on this computer. Once you do this, you will no longer be able to use
any release of MathWorks software with this license on this computer. This
process contacts the MathWorks Web site via the Internet to exchange license
Why don't you simply follow the instructions?
It is an assumption from me only, but it is very suspicious, that there are so many users asking for the same license number which expire on the same day. Direct question: Is this your license? If not, do you ask the public forum for illegal activities?
If it is your license, the messages are clear: It will expire on this day. You have to buy a new one.