please check your internet connection

I purchased Hanakuma Chifuyu AI, but when activating it, the program prompts please check your internet connection.
For some reason, my computer can only access the internet through my phone’s mobile hotspot. But before, my software was still able to detect the update.
I tried turning off the firewall, changing the network connection (wireless hotspot → wired connection), and turning off the proxy, but nothing worked.
I don’t know if this is due to the changes I made to the system settings unintentionally. I don’t really know about this. I hope someone can tell me how to solve this problem. Thank you very much!

我购买了Synthesizer V 花隈千冬,但是在激活时,程序提示“请检查您的网络连接”。