where can I get the drivers? Not sure if this is why the internal 20 pin port is not working

I did not have to install any drivers. Did you use a SATA 15-pin power cable to provide the extra power needed by the card? I did need to use an extension cable to get mine to reach far enough. (StarTech SATAPOWEXT12 1 Foot 15 pin SATA Power Extension Cable) worked for me.

Questions & Answers: EnLabs PCIEU3ACS20 PCI-e to 4 Ports USB 3.2 GEN 1 (5Gbps)(USB Type-C +USB Type A w/ Internal 19Pin USB 3.0 Dual Port) PCI Express Card, Power by 15pin SATA w/ Full-Profile & Low-Profile Bracket

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EnLabs PCIEU3ACS20 PCI-e to 4 Ports USB 3.2 GEN 1 (5Gbps)(USB Type-C +USB Type A w/ Internal 19Pin USB 3.0 Dual Port) PCI Express Card, Power by 15pin SATA w/ Full-Profile & Low-Profile Bracket

PCIe to 4 port USB 3.2 GEN 1 add on card
Data transfer speed up to 5Gb/s
1 X USB Type-C & 1 x USB Type-A external ports
1 x USB 3.0 20pin internal interface for front panel
Power by SATA
w/ Full-Profile and Low-Profile Mounting Bracket

$22^.49 –