If I renew my product before it expires, will I lose time remaining on my subscription?
If you renew the subscription on your existing product, you will not lose remaining days on your old subscription. However, you will receive a new license, subscription and activation code (also called license key). Your new activation code will automatically load the additional days left from your old subscription.
However if you are not careful in what you click on, you can lose your remaining days:
If I upgrade to a different Kaspersky product, will my existing subscription carry over?
If you choose to buy a new product through the Kaspersky Lab eStore, you are buying a brand new license and subscription to a Kaspersky product. Any remaining subscription days on your old product will not carry over to your new product.
So if you are careful in how you do things and what you click on, you won't lose anything.