Windows says printer offline, but it is not offline. network settings confirmed. windows firewall turned off. scanner works perfectly over network, but printer is "offline"

Elementary Solutions to Troubleshoot HP Printer Driver is unavailable in Windows 10:
There are thousands of printing issues and so are the solutions. There is no printing error without a solution along with that. So if your HP Printer becomes unresponsive after an upgrade, then here are the list solutions that you can try to erase the multifarious issues:
Solution 1: Fix HP Printer Driver Related Error
If the printer driver is not compatible with the system, you no longer be able to pass printing command. On such situation, you need to uninstall the printer and download the compatible printer driver again. Use in-built Add or Remove Programs option to make the process happen. Yet you can avail help from HP Printer Repair Service to avoid complicacy.
Solution 2: Fix HP Printer Software Related Problem after Upgrade
When you upgrade your HP Printer, you need to remove the software package present in the system. To do so,
§First you need to open Device Manager by typing it in the Start search box.
§When the Device Manager window opens up, click on View followed by choosing Show Hidden Devices.
§Make sure whether there are any entry related to HP Printer or not.
§If yes, remove the entries and disconnect the Printer.
§Restart the system to save the changes.
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Go to the printer's setup
Turn the printer on and press the "setup" button. On the printer's operational panel select "Wireless LAN Setup" and press "Ok."
Select setup type
Select "Easy Setup" from the available setup options and press "OK."
Enter network information
Select the network name from the access point options and click "OK." Enter the password for the Wi-Fi network selected within the operational panel and click "OK."
Run the CD installation
Insert the setup CD into the computer and click "Run Msetup4.exe" and click "Next." Follow the on-screen prompts, such as selecting the place of residence, country or region and then click "Easy Install."

For full information please visit here: https://fixingblog.com/setup-canon-printer-wireless-network

The printer offline error mostly troubles windows 7/8/10 users, The printers loses connectivity even when it is connected and operating. The status message displays offline on the computer, and the printer does not print. An Offline status indicates that the computer has failed to communicate with the printer. In some network conditions, the printer might get offline unexpectedly.

Before going to the solution for this you must know when and why printer offline error takes place:
The error may appear when Windows 8 diagnoses that the printer is unavailable, but unfortunately, most times it fails to tell whether the printer is really offline or if it has connectivity problems or printing errors. Reasons why your printer appears to be offline, include problems with hardware, such as disconnected cables or malfunctioning equipment, and problems with software, such as corrupted or incompatible driver files.
These might occur when:
1. The connection between the computer and the printer is slow/unresponsive.
2. The printer has encountered an internal error
3. There are multiple unfinished print jobs in the queue.
There are some simple steps you can follow before going to any complicated way:
Your printer offline can be a problem with the driver software. This is a small piece of code that Windows and the printers use to "talk" to each other. If the driver software is outdated, corrupted or incompatible with the version of Windows that you have installed, you may need to update it.
Restart the printer and the computer or unplug its USB cable.
Do check that the printer's power cable is plugged into an electrical outlet. If the printer is connected to a power strip, make sure the strip itself is connected to the electricity supply and is turned on.
In case you are using a network printer both wired or wireless, You restart the router as it may cause due to network failure.
Different manufacturers come with their own diagnostics software which can inform the user about the problems coming up (Ex : HP's Print and Scan Doctor), Use it as it will be really useful.
PRINTER OFFLINE ERROR Solution 1 :
Type in Services in your windows searches and hit the enter key. Click on Services option from the set of search results as shown below.
A new window for Services opens up. Scroll down and find the entry named Print Spooler.
Now right-click on Print Spooler entry and then on Properties option.
Set Startup type as Automatic from the drop-down menu.
As next, hit the Start button and wait till windows start the Print Spooler. Once done, hit Apply button.
Now if you look at the status of the Print Spooler, you can see that it is Started.
Solution 2 :
If the above method doesn't work for you, you can always try our second method. For that, type in Devices to the windows search and choose Devices and Printers from the search results.
Now find the printer that is offline and right click on it. Click on the option See what's printing from the context menu that appears.
A new window opens. Now click on the Printer tab and uncheck the option that says Use Printer Offline.