To fix the printer driver unavailable in Windows 10, you can try the following steps:
Restart your computer and printer. This can often fix minor problems with printers.
Check the printer connections. Make sure that the printer is properly connected to your computer and to a power source. If you are using a USB cable, try using a different cable. If you are using a network connection, make sure that the network is working properly.
Update the printer driver. The printer driver is the software that allows your computer to communicate with your printer. To update the printer driver, go to the manufacturer's website and download the latest driver for your printer model.
Remove and reinstall the printer driver. To do this, go to the Device Manager, right-click on your printer, and select Uninstall device. Once the driver is uninstalled, restart your computer and Windows will automatically reinstall the driver.
Use the generic printer driver. If you are unable to find or install the correct printer driver, you can use the generic printer driver. To do this, go to the Device Manager, right-click on your printer, and select Update driver. Select Browse my computer for drivers and then select Let me pick from a list of available drivers on my computer. Select Generic software device and then click Next.
Run the Windows Printer Troubleshooter. To do this, go to Settings > Update & Security > Troubleshoot and then click on Printer. Click on Run the troubleshooter and follow the on-screen instructions.