I appreciate you taking the time posting in the Community. Let's get Error 403 and 15225 sorted for you and back on track, DebsBoykinFarm.

QuickBooks Error 15225 occurs when downloading or installing the latest software updates and it usually occurs because of the incorrect internet explorer configuration.

It generally arises when QuickBooks tries to verify the digital signature of all files downloaded by the program. 

Causes for QuickBooks Error Code 15225: 

• To register a digital signature, the Internet explorer function no longer works
• Internet Explorer is not up to date
• Firewall or Antivirus software blocking to install the new update files

One thing to do before starting up with the troubleshooting steps create a backup of a company file. Make sure to back up the company file because if there would be any fall back in between the process so you can reach back to the same position where you started. 

5 Simple Steps to Fix QuickBooks Error 15225.

Step 1: Update QuickBooks Desktop

1. Open QuickBooks Desktop.
2. Go to Help > Update QuickBooks Desktop.
3. Click on Update Now.
4. Tap Get Updates.
5. It may take some time to update the QuickBooks Desktop.
6. Press Close.

Step 2: Add Intuit URL as a Trusted Website

1. Open Internet explorer.
2. Click on the top-right gear icon and choose Internet Options.
3. Select the Security tab.
4. Tap on the Trusted Sites icon and Sites button.
5. Type https://www.intuit.com/ (If using the US version) to Add this website to the zone.
6. Hit Add.
7. Ensure to make a check on Require server verification (https:) for all sites in this zone. 
8. Press Close. Then Apply and OK.

STEP 3: Install a digital signature certificate

1. Close QuickBooks Desktop.
2. Navigate to C:\Program Files(x86)\Intuit\QuickBooks and search for QBW32.exe.
3. One you found QBW32.exe make a right-click on it and select Properties.
4. Click on the Digital Signature tab and ensure that Intuit Inc. is selected in the list.
5. Press Details.
6. In the Digital Signature details windows, click View Certificate.
7. In the Certificate window, click Install Certificate.
8. Press Next until the finish is displayed.
9. Then click Finish.
10. Restart the computer and then open QuickBooks again.
11. Now Download the Update once again. 

Step 4: Turn Off Firewall and Network Protection Temporary 

This issue may arise because the firewall or some security software is blocking to download the latest updates. It’s good to turn them off for a temporary period of time.

1. Make a right-click on the Start button
2. Choose Settings
3. Click on Update & Security
4. On the left pane, choose the Windows Security tab and click Open Windows Security
5. Under the Windows Security window, choose Firewall and Network Protection
6. Press on Domain, Private, and Public Network one by one and turn off the Microsoft Defender Firewall with all type of network.

Now try to install the latest updates of QuickBooks. 

If the above steps won’t work, you may also need to Uninstall and Reinstall QuickBooks Desktop in order to fix this problem permanently. It also could be your computer Windows issues. 

Make sure to restart your computer before downloading an update. Let me also route you to these articles for more details:

• Error 15xxx (15000 series) when getting updates
• Verify And Troubleshoot QuickBooks Desktop And Internet Explorer Settings

While error code 403 occurs when there is some misinterpretation of the proxy details accessed by the software. The main reason behind this is that the user is denied access to connect with the Web.

You can follow these steps below to get rid of these errors. Here’s how:

1. Shut down QuickBooks Desktop.
2. Go to the Windows Start button, followed by right-clicking the Computer option and press Manage.
3. Click Services and Applications, then double-click the Intuit QuickBooks FCS.
4. Choose the Startup type dropdown from the General tab, then select the Manual option.
5. Tap on the Apply and then select the Start button.
6. Click Ok, then open your QBDT.
7. Download the QBDT product updates, including the payroll tax table.

To resolve the error 403, you can follow these steps:

1. From the Start menu, search and select Control Panel.
2. Select the Settings and double-click Internet Options.
3. On the Connections tab, select the LAN Settings button.
4. Remove the check under the Proxy server section and click OK.

Here's an article that you can check on: Fix error 403 in QuickBooks Desktop

In case these specific methods doesn’t make a change, you can also try this tool to resolve them: Repair your QuickBooks Desktop for Windows.

Should you have other concerns or questions, know that you're always welcome to post here anytime. Stay safe always!