It seems that questions like "How to merge my old and my new subscription when renewing early" and "Will i lose ... months/days cover of my existing subscription when renewing early" are very often here in the community.
So, based on my previous and today's experience, here are the instructions for merging the old and the new subscriptions when renewing early, without losing the remaining validity of your current subscription.
I had a subscription for Bitdefender Total Security with expiration date March 29, 2023.
Today i got a new valid Activation code for the same Bitdefender product.
After receiving the code, i signed in to Bitdefender Central here:
When signed, i went to My Subscriptions -> Subscriptions -> +Activate with code.
Next, in the white box, i entered the new code and clicked on "Activate".
After that, in the next dialog box, i selected this option: "Extend current subscription" and clicked on "Confirm activation".
In the next dialog box, i was informed that the subscription has been extended.
Then, back in Bitdefender Central, "This license will end on March 29, 2023" was automatically changed to "This license will end on March 29, 2024".
It takes time (less than 5 minutes) for the new subscription details to be applied to all devices that have Bitdefender products installed.
Sometimes, the new subscription details won't be applied automatically on some Windows devices, like here:
but if that occurs, here is what to do:
Click on your account's name in the upper right corner of the program, then click on "Switch Account", enter the existing e-mail and password that you already used for the subscription and after the process will finish, the new subscription details will be applied, like here:
That's it.
As you can see, i didn't lose the remaining validity of my current subscription, which was about to expire on March 29, 2023, but the subscription was just extended to March 29, 2024.
Best regards. 😊