Over the weeks your users have been getting license activation errors because "Unable to connect to the server (-105)". This is not an issue on our side because our connections are fine.
The only workaround that worked is by enabling VPN on our system just so Live2D can phone home. I am fortunate enough that I have paid VPN, but all other users are much less tech savvy or can't afford to pay a VPN. Not to mention that Free VPN may have privacy risks behind it. You don't want your users to risk themselves in order to use the software that they paid for, don't you? Even if that's not the case, then why your software the only one having trouble out of all apps installed on our PC? I can tell Firewall is not the problem here because Live2D is still able to show welcome screen, and afaik that needs an internet connection to show the banners.
This has been ongoing issue for months, and this is not just me, but my friends and peers over Live2D community all over the world has been having same issue as well. Even your Japanese users had them.
You should know this affects mostly to PRO license holders, and Live2D has been showing its negligence by letting this issue slide to their paying customers.
I'd like to see an official statement over this issue, because the solution that your staff proposed once
definitely doesn't resolve things.