Thanks for mentioning this Luna.
I am not sure I understand what you are saying exactly. You had to download Animation Paper three times – because it failed to find the destination it needs to install to? It doesn’t make sense to me. Could you try to describe it more – does the installation process display any errors or warnings?
Yes, you are free to install Animation Paper where ever you want. Default is in your program files folder, but you can just change that when you install.
Almost all functionality has keyboard shortcuts. It’s a good idea to memorise your most important tools and features – take a look at the shortcuts here: https://animationpaper.com/animation-paper-keyboard-shortcuts-for-pc/
In the current alpha version (alpha 3) it is not yet possible to customise the shortcuts. But it will soon be – with one of the following alpha releases.
Let me know about your question 1 and if you have anything else.