As I understood there is no other way, the way is to migrate. I'll contact someone in InterSystem to help me in the upgrade process. Thanks everybody for the answers! 

I'm new to Cache development, this is a new world for me. I need 'Api Atelier' to use Visual Code, wich I was able to configure and runs ok on 2018.1 version. Update Cache could be challeging for me, because it could raise some errors that I would be in trouble to resolve. But if it doesn't have another way, I'll see what I can do. Thanks!

Thank you Danny and Eduard! 

I'll verify what you said and run some tests as advised.