Here you can find Panasonic PBX driver for KX-TDA,KX-TVM,KX-TE.
Supported operating systems : Windows 98, ME, 2000, XP, 2003, 7, 32 and 64 bit
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Also you can download the Panasonic Maintenance Console version 3.0
Driver v2.3.0.0 KX-TDA,KX-TVM,KX-TE for Win 98 ,Me, 2000, ,2003 ,XP , 7 (32 and 64 bit) : USB-v-2.3.0.0-Drivers-for-KX-TDAKX-TVMKX-TE.zip


Maintenance console V 3.0 : KX-TE-Maintenance-Console_V-3.0.zip
UPDATE 08.01.0216 : If the maintenance console asks for a password when you click connect, try 1234.
PDF install file for WindowsXP : UpdateDriver_XP.pdf
PDF install file for 2K : UpdateDriver_2K.pdf
Panasonic installation manual : PA824_Installation_Manual.pdf
Used on Win7 Professional 64bit with Panasonic KX-TES824CE.
PBX Specifications :
Model No. TEA308 TES824 TEM824
CO lines Basic 3 3 6
Max 8 8
Extensions Basic 8 8 16
Max 24 24
Intercom paths 3 4 4
DTMF receivers 2 2 4
Door intercoms and openers (max.) 2 4 4