HTC Sync Manager will no longer be supported.
To transfer content from one phone to another, download the
HTC Transfer Tool to your old phone and use it to transfer content to your new phone.
For details, see
Transferring content from an Android phone.
Before you do a factory reset, back up your phone data to your
Google Account which will be stored in your
Google Drive storage. After the factory reset, you can restore your data while setting up your phone.
To transfer content between your
Mac computer and HTC phone, you can use a file transfer software such as
Android File Transfer on your computer. Go to
android.com/filetransfer/ to download and learn how to use
Android File Transfer.