AXAGON M.2 SSD disk adapter is let say only HW connector change from M.2 into PCI-Express or SATA. Adapter itself do not have controller electronics and need no drivers. It is necessary to check M.2 disk driver availability for older OS like Windows 7.

Proper M.2 adapter function requires:
- computer mainboard support M.2 disks – SATA disks are more often supported than NVMe disks,
- computer mainboard support booting from PCI-Express bus – in case of OS installation to M.2 NVMe disk,  
- driver availability for M.2 SSD disk – apply especially for NVMe disks on Windows 7 OS.

Please contact the motherboard manufacturer's technical support to determine support for motherboard M.2 drives. In some cases updating the BIOS/UEFI is sufficient.
Check the M.2 SSD driver availability on the manufacturer's website or contact the disk manufacturer's technical support.

The disks connected to the SATA motherboard controller are usually displayed In BIOS/UEFI. The NVMe disk is usually displayed in the "Disk Boot Order" menu.
This applies when the requirements of "Prerequisites for proper M.2 function" are met.

A): Check if the M.2 disk type is NVMe (neither SATA M.2 drives nor mSATA drives are covered by this box)

B): Update the firmware of your NVMe M.2 drive using the manufacturer's utility

C): Update the firmware of the external box - download link