There are a couple of ads in the footer of some of the skins we ship with mojoPortal, but you are free to remove those. The html for those are in the layout.master file of the skin located under
/Data/Sites/[SiteID]/skins/[skinname]/layout.master
where SiteID is typically 1 in a single site installation and skin name corresponds to the skin name you see in the skin dropdown under Administration > Site Settings
you can edit the layout.master file with any text editor like Notepad for example
We don't have any ads that are forced on you using mojoPortal. There is no pro version of the CMS but the add on Products in our store are our Pro features.