Flyve MDM depends on inventory features of FusionInventory for GLPI.
Go to glpi/plugins/
Download FusionInventory for GLPI, you can get it with any of these methods:
From the Get it section on their website.
From GitHub Releases.
Keep in mind the type of file you download, to unpack a tarball you need the following command:
tar -xvzf file-name.tar.bz2
Using Git, for those who are familiar with it:
git clone https://github.com/fusioninventory/fusioninventory-for-glpi.git fusioninventory
For more information, check the Fusion Inventory Documentation.