Download previous versions

Hi everyone!!!

I hope you can help me here. 

I've been having some issues with the newest versions of the software, maybe because my laptop is kind of old (i've been using it for nearly three years). The thing is that i've been trying to find the CC2018 version (i've downloaded theese versions on premiere and after effects and they work perfectly to me), but i can't find it (there's plenty of free-download pages but i don't trust them, that's why i'm using a subscription).

Do you know if there is anyway where i can find the cc2018 installer??

Thank you so much!!

(P. D.: i'm from Spain, i've tried my best writing in English, please don't blame me for any grammatic or ortographic error, thanks)