Hi I have installed ADE 4 and I have downloaded ebook from Koorong but can't open

I have this error message:

Process:               Adobe Digital Editions [9740]

Path:                  /Applications/Adobe Digital Editions 4.0.app/Contents/MacOS/Adobe Digital Editions

Identifier:            com.adobe.adobedigitaleditions.app

Version:               4.0.3 (1)

Code Type:             X86-64 (Native)

Parent Process:        ??? [1]

Responsible:           Adobe Digital Editions [9740]

User ID:               501

Date/Time:             2015-03-02 18:25:22.367 +0800

OS Version:            Mac OS X 10.10.2 (14C109)

Report Version:        11

Anonymous UUID:        6B1DA70B-8CF2-4CCB-05E9-2C8DF3709255

Sleep/Wake UUID:       51DA4718-BC41-44DB-94A5-883AFD083E71

Time Awake Since Boot: 98000 seconds

Time Since Wake:       75 seconds

Crashed Thread:        0  Dispatch queue: com.apple.main-thread