Dears
My Lab Test server is not connected to Internet and it shows determining MIB database is failed.
What should I do to import MIBs Offline.
If it's offline, you must download the file from your Customer Portal, transfer it over to your lab server, then run the installer. You can find detailed instructions at: https://documentation.solarwinds.com/en/success_center/orionplatform/content/core-downloading-the-solarwinds-mib-database-sw3581.htm
I downloaded the trial version and I'm not the customet for now so I don't have customer portal for now
The trial version should contain the latest version at the time they compiled the package. No need to worry then. You can disregard MIB DB related warnings. Basically, it just tell you it wasn't able to check if any new DB version exists, but you already have v. 1.3.0.50082 installed.
the Matter is that I want to add other devices MIBs and I don't know how
To add MIBs to database, you'll need to be a standing customer. See https://support.solarwinds.com/SuccessCenter/s/article/Add-MIBs-to-the-SolarWinds-MIB-database?language=en_US