Change podcast settings in iTunes on PC
In the iTunes app on your PC, use the Podcast Defaults to change options for any podcast that doesn’t have its own settings.
To change these options, choose Podcasts from the pop-up menu at the top left, then click Defaults at the bottom of the window.
Choose how often iTunes checks for new episodes. If you choose Manually, you can check for new episodes by clicking Refresh at the bottom of the list of podcasts in the iTunes window.
Choose the maximum number of episodes you want to keep. Any episodes over the maximum are automatically deleted. If you don’t want any episodes to be deleted automatically, choose Off.
To have iTunes automatically download new episodes when they become available, choose On. If you don’t want any episodes to download automatically, choose Off.
Delete Played Episodes
To have iTunes automatically delete episodes after you play them, choose On. If you want to delete episodes manually, choose Off.