Thank you for posting on the CostX Student Forum.
There are absolutely no issues if you do not install CostX before the expiry date; by default, licenses for students studying in universities in the Northern hemisphere will expire on 30-Jun of each year and 31-Dec for Southern hemisphere students.
Thus, even though your license will expire by default, you can still apply for another serial number anytime before or after the expiry date.
I hope that helps. Please contact email@example.com if you have further queries.
CostX Forum Admin