I have two things I can't figure out.

1- I am using BIAB for many years. I have many files as backup because of that. This is many Gb. But I think I can delete a lot. Take this file for instance: realtracks_mega_1.exe. I have one from 2015 and one from 2016. Is the 2016 only an update, or everything previous + the update. I think the last one, but I want to be sure before I start major deleting.

2- According to Help > What add-ons do I have? in Biab, I am missing many files. Especially Real Tracks. I do not see anything at my BIAB account. How do I solve this? Is it somewhere hidden at my account?