1.Download the Dsetup-V7Beta.zip file from here http://forum.l2tower.eu/thread-new-dsetup-no-accounts-limit-no-l2tower-needed-accounts-limit-bypass (this dll u need to bypass their ngameguard)
2.Unpack the files, copy and replace them into your system folder.
3.Update your tower to latest version (atm 1.4.2.135) and run l2tower as administrator
4.Create a new license file
5.Select the l2bin your IO client (should be like C:\Program Files\NCSOFT\Lineage II\system\L2.bin)
6.Run & inject and happy botting :-beep- yeah:
P.S:Working for me since last maintenance which was on 18/06/2015
Run tower as administrator, if it still dont work, search again for l2bin in your system and if it still dont work try repair your client ( with repairing your client you will again need to replace the dll so u can bypass the ngameguard) and then try again select l2bin.