As Booster is no longer available for new customers for Android use simpli Clean which looks much like Booster used to.
We have a detailed list of FAQ's about Booster End-of-life here. Please have a look at the article for any questions related to this.
Thanks. My post was actually not a question, but a statement so I will not mark you post as the solution.
The link you provided certainly answers most of the questions I could have thought of.
Just to be clear for Android users a mention of their future could be also in the FAQ.
I was just adding on to your post as we have a FAQ on Booster end-of-life and this would be helpful for anyone who sees your post. Sorry if I was not clear in my previous reply.