Hi and Welcome. My Name is ***** ***** I look forward to assisting you today with your question.
HP has not released driver for that scanner for OS X 10.11 and it is not going to be I believe. So you have to use a third party driver application and driver named VueScan to use the scanner with your Mac (use trial version first) --> http://www.hamrick.com/#download
VueScan support wide variety of scanners and it is a little bit costly. It is compatible with OS X 10.11 and support your scanner moel.
Before you try VueScan, did you try adding the scanner from System Preferences > Print and Scan ? Open Image Capture application and does it recognize the scanner ? If not, then your only option is VueScan.
If you have any questions or would like any additional information, please don't hesitate to ask
I checked VueScan and found that it is compatible with Scanjet 4600
Let me check again and let you know.
It is compatible. See here ---> http://www.hamrick.com/vuescan/hp_scanjet_4600.html
VueScan has been updated to work with 10.11
Can you delete the old VueScan and download the new one ?
Please download and try the latest VueScan. Let me know.
This article says that it is compatible. Did you download latest Vuescan ?
See this article --> http://www.hamrick.com/vuescan/hp_scanjet_4600.html
Delete old VueScan using this application App Cleaner --> https://freemacsoft.net/appcleaner/
Then download latest VueScan from here --> http://www.hamrick.com/files/vuex6495.dmg
If that VueScan didn't work, then download this version --> http://www.hamrick.com/files/vuex3295.dmg
Is it still not working ?
Even though it says like that, it works without HP drives for some models. Let me know check for some third party drivers
Please try the TWAIN drivers --> http://www.ellert.se/twain-sane/
Those are pkg files, which means you can download and open the pkg files to install. These are the only third party drivers I could find. Download and install all 5 packages
Download this one --> http://www.ellert.se/PKGS/TWAIN-SANE-Interface-3.5/10.11/TWAIN-SANE-Interface.pkg
Double click on the .pkg file download and what does it bring ?
Download and and open this package --> http://www.ellert.se/PKGS/libusb-2015-10-21/10.11/libusb.pkg
Install this one --> http://www.ellert.se/PKGS/sane-backends-1.0.25/10.11/sane-backends.pkg
And this one also --> http://www.ellert.se/PKGS/gettext-0.19.6/10.11/gettext.pkg
This one also --> http://www.ellert.se/PKGS/gettext-0.19.6/10.11/gettext.pkg
Then install this --> http://www.ellert.se/PKGS/SANE-Preference-Pane-1.5/10.11/SANE-Preference-Pane.pkg
and finally --> http://www.ellert.se/PKGS/TWAIN-SANE-Interface-3.5/10.11/TWAIN-SANE-Interface.pkg
Are you getting this error when you install TWAIN SANE interface package ?
It has be to installed in Applications folder. Install this --> http://www.ellert.se/PKGS/SANE-Preference-Pane-1.5/10.11/SANE-Preference-Pane.pkg
This is the last package to install --> http://www.ellert.se/PKGS/TWAIN-SANE-Interface-3.5/10.11/TWAIN-SANE-Interface.pkg
Install it in Applications folder
Restart your Mac. Go to System Preferences > Print and Scan. Can you see the scanner now ?
Open Applications folder and do you see TWAIN application there ?
Connect the scanner to different USB port, then open Image Capture application. Do you see anything under Devices in left ?
I'm really sorry, that means the scanner is not compatible with your Mac. This is the only driver I could find.
Since I couldn't solve your problem, you can contact***@******.*** for refund.
Please don't rate the answer anything to process refund. Sorry I couldn't solve your problem, but this is an hardware related compatibility issue.
You're welcome !