Just opt out of the developers preview program—-> restart you device——> Check for updates.
Keep in mind that since a new OS version 8.10.14234.375 is available for Lumia 1020 in India as part of Lumia Denim update, you are being offered an update. If you are already on OS version 8.10.14219.341 (developers preview) and the tracker shows similar OS version available for you device under Lumia Denim, you may not be offered an update at all, as all the devices except Lumia 830, Lumia 930, Lumia 1520 and Lumia Icon won’t mostly receive any firmware update with Lumia Denim.