Simply run the installation with the following parameters:
/REMOVE_FEATURE fea_AVG_SafeSurf /REMOVE_FEATURE fea_AVG_SafeSearch
As you can see, the SafeSurf and SafeSearch features are removed using this parameters, and the Linkscanner will not be installed.
Update: The newer version of AVG 8.0 free has an option to not install link scanner if you choose ‘Custom’ when installing the program.