The good news is all our licenses are multi-domains / multi-sites. It means that if your purchase an extension license, you can install it on all your clients websites, no limitation.
Yes, absolutely! Every JoomUnited plugin, extension is fully internationalized and we've developed a special tool to load languages or translate extensions in one click.
Each extension have a full updated documentation accessible by everyone (online). Start quickly with our extension or help your client as final user. Use the menu Support > Documentation
Sure, all our memberships include a two levels technical help. All the support is made by our developer team, we mean the developers that have created the extension, no jokes.