Not able to uninstall Kamo from PC

I tried to uninstall Kamo. It is not possible! I tried to install new version on Kamo. The one, which I have, was installed in September 2023. It is not possible to install new Kamo version as well. The original licence key has expired. I have got new one, however I cannot enter it into existing version. The link for entering the licence key on Kamo window does not work. I can only click to close the window or click to buy one, which is useless, because I have already bought it and I have got the licence key.