This post onMiniTool Websitewill help you out on that.
Without further delay, lets start!
Driver Is Unavailable Printer HP
How to Fix Printer Driver Is Unavailable HP?

Fix 1: Update Printer Drivers
ensure whether your printer driver is the latest version or not.
If your HP printer driver is not running, chances are that it is outdated.
Right-hit theWindowsicon on the lower-left corner of your screen and chooseDevice Managerin the drop-down menu.
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ExpandPrinter queuesto show yourHP printer driverand right-select it to chooseUpdate driver.
You just need to uninstall and reinstall it to fix this tricky issue.
PressWin + Rat the same time, typedevmgmt.mscand hitEnterto launchDevice Manager.

ExpandPrinter queues, right-select your HP printer driver and selectUninstall rig.
If a confirmation message appears, tickDelete the driver software for this deviceand pressUninstallto confirm this action.
Wonder where and how to download drivers for Windows 10?

This post introduces 5 ways to help you download and drop in the latest Windows 10 drivers.
PressWin + Ito openWindows options.
Scroll down to findUpdate & Securityand hit it.

InWindows Update, hitCheck for updatesfrom the right pane.
If there is an available update, hit it to update.
Reboot your unit to apply changes.
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Typecmdin the search bar to locateCommand Promptand right-tap on it to chooseRun as administrator.
This process will take some time, kindly wait patiently.
Move 1: Download the Driver File from Official Website
Step 1.
Go toHP Official Website.
Click onSupport>Software & drivers>Printer.
Step 3. type your product name, hitSubmitand then the driver file will be displayed.
Press the file and it will start to download automatically.
Move 2: fire off the File in Compatibility Mode
Step 1.
After the file is downloaded successfully, right-hit it to selectProperties.
In theCompatibilitytab, checkRun this program in compatibility mode forand chooseWindows 8from the list of options.
TickRun this program as an administratorand hitApply&OKto save the changes.
Right-grab the driver file to start the installation process.
Step 5. reboot your rig.
Is HP Envy 4520 not printing color/black or does it print blank pages?
if you catch one situation, find solutions here to troubleshoot it.