Option to choose installation destination (Windows)
We currently install to %localappdata% which has many advantages - for example, the installer don't need admin permissions.
But easier way for the user would be an option in the installer to choose installation destination.
What you can do now is to move the latest version of avocode from %localappdata%\avocode (simply copy the path to file browser location to get there) to any place you need. You will need to do that after every update though, another option would be to symlink the directory to HDD which should work fine, using something like this: http://blog.danieljost.com/symbolic-links-save-space-ssd/
Avocode also stores all downloaded documents to %userprofile%.avcd\userdata - you might want to symlink this folder to HDD as well.