Sorry it's my first time trying to use Sini but I installed it with the 3ds Max open, so when I have tried to use it show and connection failed. I already uninstall and install it again, but doesn't change it at all.  Could someone help me?

Hello,

Please use the support ticket system in your user dashboard for support. https://docs.sinisoftware.com/technical-support
For more help check out the Help Docs https://docs.sinisoftware.com/desipher-license-manager