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1. If for some reason, the service was not successfully installed, you can verify the error log details in the file eConnectProxy12.InstallLog or eConnectProxy.InstallLog files.
2. Note: Following are some of the known issues working with installtuil utility for any file downloaded from the internet and resolution steps to avoid/prevent them.
3. If you are getting an error with regards to file permissions, right click on the eConenctProxy.exe file and click on UnBlock as shown below. 
   
   
   
   

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It is necessary that the On-Premise version of DBSync is used for MSCRM Online and Microsoft Dynamics GP Integration. In order to use DBSync On-Premise, DBSync should be installed locally and DBSync Account should be switched to On-Premise from On Demand.
The process of installing DBSync is explained in the below link.
http://help2.mydbsync.com/docs1/display/dbsync/DBSync+On-Premise+Installation
The process of switching DBSync Account from On Demand to On-Premise is explained in the below link
http://help2.mydbsync.com/docs1/display/dbsync/DBSync+On+Demand+to+On+Premise

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