Product activation

Hello,
1) A few weeks ago I made an account in STUDENTsever, downloaded the latest version of RAM elements 16.00.00.37, however when I opened the product, I was received with a 7-day test dialogue, after 7 days I did not want to enter the program, 
I found that my version had expired, I can not enter the program anymore, I had to uninstall it, my question is: why is this problem,
I had to install an earlier version of RAM elements (15.00.00.18) because if I returned to install the latest version, the same message appeared that my trial version expired

2)in the current version that I have of the program (15.00.00.18), this message appears to me (image) I would like to know if I will have the same problem again


2)
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