This apk file is present in the internal storage of your phone and needs to be installed.
First go to Start menu > Settings > Security > Check Unknown Sources.
Next go to Start menu > File Manager > AndroidHtcSync2.apk > install.
Connect your phone to HTC Sync Manager, it should be detected now.
First go to Start menu > Settings > Security > Check Unknown Sources.
Next go to Start menu > File Manager > AndroidHtcSync2.apk > install.
Connect your phone to HTC Sync Manager, it should be detected now.