This driver works with 95/98/ME...I do not know about any other OS. Just unzip to a folder and then right-click on the .inf and select install or simply direct the hardware wizard there.
The following files are found inside the driver download file.
|System Tools/Aztech_v90/azldr.vx_||4.3 KB||18 May 1998|
|System Tools/Aztech_v90/azmodem.inf||53.6 KB||21 May 1998|
|System Tools/Aztech_v90/azdll.dl_||18.7 KB||18 May 1998|
|System Tools/Aztech_v90/azmodem.vx_||330.8 KB||18 May 1998|
|System Tools/Aztech_v90/azexe.ex_||25.2 KB||18 May 1998|