That is odd, I just tried the same driver and it resulted in a *.msi file being downloaded. Would think for the bulk of drivers it would be either an *.msi or *.exe that can start running by double clicking it. Any chance your organization's firewall may have renamed the file as *.txt? If so could try to rename it back.
That was the issue! It was definitely supposed to download as a .msi and not .txt.