Both places would be great for both Mac and PC.

People have a habit of not seeing things when going through store checkouts and It would also apply to freebies too. Realistically most products use to include installation instructions in their product readmes. Somehow customers seem to miss these instructions to :) That's probably not a bad place to start if you're looking for source text on the process. Thoug looking Rpublishing products seems they don't bother with that anymore...

Naturally if they get stuck they will come here.