I'm cant seem to down load p45 even though it's highlighted

Hello, @atherton_joanne.

I'm here to contribute steps, so you're able to download the P45 in QuickBooks Online. 

At times, unusual behavior may occur in QuickBooks. Stored cache files on your browser can sometimes cause this to happen. With this, I'd suggest performing fundamental troubleshooting steps to isolate the dilemma. 

Let's begin by accessing your account in incognito. These browsers won't save any browsing histories. 

Feel free to use these shortcut keys:

• Google Chrome: Ctrl + Shift + N
• Safari 11 or newer: ⌘ + Shift + N
• Mozilla Firefox: Ctrl + Shift + P
• Microsoft Edge: Ctrl + Shift + P

Once you're in, re-download the report to verify if it's already performing accurately. If it's working fine, we'll have to go back to your regular browser and clear the cache to eliminate the junk files. Using other supported browsers is a good alternative too. 

If the issue persists, please follow the steps displayed in this article to isolate the problem: How to update, repair, or re-install Adobe Reader/Acrobat.

I've also attached pages that might help you in fixing the printing issue and handling various reports. 

• Fix QuickBooks Online printing issues on browsers for Windows
• Test sequence for PDF printing issues
• Reports

I'll be right here to help if you need further assistance. Take care always, @atherton_joanne.