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Download the Ares Galaxy installer. Setup your sharing preferences. Set your download location.
Be sure that you download the installer from a trusted website, such as the Ares Galaxy home page. Ares Galaxy is a free program, never pay to download it. Once Ares is running, open the Control Panel in the program. Select the Filesharing tab, and the start an auto-scan. Once the scan is complete, select the folders that you would like to share. File sharing communities are based off sharing with others. You are likely to be blocked from other users if you don't have any files shared. Open the Control Panel in Ares and select the Transfer tab. Change the "Download folder" to whichever folder you would like. The default folder is the My Shared Folder on your desktop.