Hello @SteveGC
You can try to use the latest driver available at HP.com
https://support.hp.com/us-en/drivers/selfservice/hp-scanjet-g4010-photo-scanner/3236364
Hopefully it will allow you to use your scanjet.
Regarding the HP Photosmart Application I found this :
https://www8.hp.com/us/en/ads/print-projects/photo-creations/retire.html
Thank You for 10 Creative Years!
HP Photo Creations program has retired since November 30, 2019. The software no longer runs after that date.
Over the last several years, HP has worked diligently to make it easier to print from desktop and mobile. After November 30, 2019, please use the built-in apps for Windows, macOS, and your mobile devices for the majority of your printing needs. You can also install the HP Smart app to manage your printer and access solutions designed to increase your productivity and creativity. HP Smart is available for Windows, Mac, iOS, and Android devices. HP Smart is a free download at https://123.hp.com
I hope this info Help you.
Happy New Year !!
I am an HP employee