Syncing books on ADE from computer to Ipad

[lg2016]

Can anyone let me know how to sync books I've alredy downloaded onto my ADE (version 3) for MAC with my ADE (v.4.5) on my ipad? I checked to see if ADE version 3 for computer had been upgraded but could not find a later version. Most of the books I'd like to sync are borrowed library books.

[Nanaky]

Its works only with used the same Version 4.5 and 4.5. Also at moment work only one way also ipad -> Mac.