Now really can't print from Officejet Pro 8600 Plus

Question

This is my second attempt to get help.  The first help made it worse.  I had been unable to print from my wireless printer from my MacBook Pro, iPad, or iPhone.  After about 20 hours I got it to print from a cable (it sees my network but none of my devices can see it).  So I posted here asking for help and was told to uninstall the software, repair disc permissions, and reinstall the software.  But when I downloaded the new software my computer would not install it because it says it is for Mac System 10.7 or less and I have 10.10.  So now I can't print anything at all.  I need this for work.  Please help me fix it for real.  I can't take this any more.  
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Answer 1

Thanks for providing that information JeanneS1. I have provided some more information that should help us resolve this issue. I know you have already spent a lot of time on this, but I am willing to continue trying to get this working properly over the wireless network. 
Power cycle the router, restart the Mac and the printer.
I would print off a Configuration Page to see if the printer still has a valid IP address.
Try to access the printer's Embedded Web Server. If it connects then the printer is still on the network.
If you don't have a valid IP address, once more run the Wireless Setup Wizard on the printer.
Setup a Static IP address for the printer, this way the router will always assign the same IP address to the printer. Which should stop the disconnection.
Here is a document on this issue. But for now just follow Solution two: Assign the printer an automatic static IP address under Mac. Printer Does Not Maintain Wireless Connection.
Click the Apple menu and then click System Preferences. Click Printers & Scanners, highlight the printer name on the left side and delete the old driver, click the + sign to add the driver, you might have to click the drop down to select the printer's name to add it in.  (Officejet Pro 8600 Plus)
Here is a screen shot.
Then test the printer.
You might need to update the printer's firmware if you haven't already.
How far is the printer from the router?
Here a few causes of why the printer can lose the wireless connection:
The recommended distance between the printer and the router is 1.0 meter to 1.5 meters (3 ft to 5 ft).
A nearby device that emits radio signals (such as a microwave or cordless telephone) might interfere with the wireless connection.
A virtual private network (VPN) prevents the printer from accessing the computer and wireless network.
The network connection is no longer active, or has low signal strength.
The printer goes into sleep mode or standby mode.
A firewall prevents the printer from accessing the computer and wireless network.
What kind of router are you using?
What kind of security are you using? (WPA2/WPA, WPA Personal, WEP)
What band is the router set to? (2ghz or 5ghz)
I believe by changing these settings on the router will help with this issue if it continues. You might need to contact the router company to make those changes.
Make sure that on your wireless modem, the channels for 2.4Ghz and 5Ghz are fixed and are not set to automatic !!
Select channel 6 for 2.4Ghz and channel 36 for 5Ghz frequency.
Hope this helps get you up and running again.
Thank You.
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Gemini02
I work on behalf of HP