USB-GSM internet doesn't work on my new iMac but works in other Macs

Hi!
I have a Sierra Wireless USB - GSM internet device and it works perfectly on my laptop.
I just got my new iMac and I plugged the device in as normal...
Once I introduce the USB modem, the iMac opens the installation program included on the device and I install normally. I restart the computer and the program doesn't detect the device. It also happens, that every time I introduce the device on the USB port, it activates again the installing program.
But it works perfectly on my laptop and I also tried it on another new iMac and it worked perfectly.
What can be the problem and how to solve it?
Thanks!

I found it!
https://sierrawireless.custhelp.com/app/answers/detail/a_id/806/kw/no%20device%2 0detected
Regards!

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