2018 install

I have a probem. i have buyed a new student license for adobe products. but now i can download only 2019 versions. And not the 2018 versions. What happed when i download it i have to buy the version. but i have a packet for adobe with al the products in it. how to i fix this. because on my school we only edit in 2018 en not 2019. 

If you have the solution please say it. Its in a hurry because we are making a 38 hour project and i need the 2018 version.