The UMAX Scanner Astra 4000U Vista Scan listed below is version 3.81 of the scanner driver. This Vista Scan version supports only the Astra 4000U, under Windows 98/SE/Me/2000/XP. Note the operating systems which it will operate on. The hardware is rather old so finding a new driver is going to be tough.
UMAX Scanner Astra 4000U VistaScan
You will need to download the file. Then extract the content of the file and click on the .exe file. This will not install the UMAX scanner driver. You can now see the driver listed below. This is the Vistascan driver from UMAX. Once installed the system will now test the scanner. Most of these scanners on the market is found now mainly on the secondhand market.