Please kindly note that the perpetual license authorizes you lifetime access to only the major version that has been purchased and you can get minor updates for free within this major version. But it does not include new major upgrades. That is why after you update the program, your perpetual license of the old major version won't activate the new major version program.
We highly recommend you pay for an upgrade with our exclusive discount so you will be able to explore the brand-new version. You can go to the upgrade page below and enter your license email to check the price.
https://videoconverter.wondershare.com/buy-uniconverter-14-with-discount.html
If you do not need that yet, you can feel free to go back to use the old version you purchased.