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Your printer is compatible with Windows 10.
Click here: http://support.hp.com/us-en/drivers/selfservice/HP-Photosmart-7520-e-All-in-One-Printer-series/5199461/model/5199462
Click on Download next to the Full Feature Software and Drivers
Select "Download only" then click on Next
The program will start to download then run the downloaded program to start the install. The program will walk you through setting it back up for you.
If you have anymore questions, please let me know otherwise if you can take a minute and use the rating system to rate our session as 4 stars or higher and press Submit so I am credited with helping you.
I am checking back up on you about your issue. If the issue is resolved or you do not need anymore help, please rate our session as 4 stars or more and press Submit so I am credited with helping you otherwise please reply back so we can continue with the issue.