@Leo78256 - The limit of 5 applies to the number of books you can download via MapleRead CX's PC Upload feature, if you're using the free version. To get unlimited access, you can easily in-app purchase "Pro Upgrade". (Tap the Library Settings icon)
If you're going to read also on iPad, then get SE or CE, depending on your need. For a very detailed description of the features of SE, CE, CX, please read
this webpage on our website.