I've started using Wineskin and, when I created the first wrapper, it told me that it couldn't find mono and gecko and that it could download and install them for me. The prompts were X11 modals managed by Wine.
It downloaded and installed them, and I can find them in the created wrappers, but I don't know where the source files have been downloaded to. They're not in ~/Library/Application Support/Wineskin.
I want to know where they are just because I don't want to leave behind useless large files when I'm done with Wineskin.
Best Answer
I've kept digging and I've located them in
~/.cache/wine/, which containswine-mono-4.7.1.msiandwine_gecko-2.47-x86.msi, both created when I created the first wrapper.