If you can't open the IAHgames official website, please try MMOsite download ! Highly Recommended !
Game Client (799.18mb) : http://download.mmosite.com/download.php?id=2783
Dragonica Update Patch ID : http://download.mmosite.com/download.php?id=3260
Dragonica Manual Patch 0.1.7 : http://download.mmosite.com/download.php?id=3261
For gamers who are experiencing slow patching speeds and issues updating your client, please click this article for manual patch download instructions and save the hassle of a slow patching speed!
INSTRUCTIONS
FOR MANUAL PATCHING TO 0.1.7 1. Download Update_PatchID.exe. 2. Download DGNSG_ManualPatch_0.0.1_to_0.1.7.exe and save it
to the client installation folder. 3. Run Update_PatchID.exe 4. Browse for the Dragonica client installation folder. Click
"Install". 5. Choose "Yes" when prompted to confirm file replacement. 6. Run DGNSG_ManualPatch_0.0.1_to_0.1.7.exe now. Your client should patch itself to 0.1.7. 
