I've got a helpful method for fixing the Standard Bank Feed error (160) you've encountered in QuickBooks Online (QBO), @Lindie.

Before we start, please know that you've done a good job performing the recommended initial troubleshooting steps. This helps me assess the situation and guide you with the next action you can take.

Banking Error (160) is a connectivity flaw between your financial institution (Standard Bank) and QBO. To resolve this, you can manually update your account. This refreshes the connection between your bank and the program to automatically downloads your latest available transactions. Here's how:

1. Go to the Banking or Transactions menu.
2. Select  the blue tile for Standard Bank.
3. Click the Update button.
4. (Optional) Follow the on-screen instructions to complete the process.

I've attached a screenshot below that shows the first three steps.

To learn more about the process above and all other recommended troubleshooting steps, you can refer to this article: What to do if you get a bank error or can't download transactions in QuickBooks Online.

Once your transactions are downloaded, you'll have to review and/or match them to the existing entries in QuickBooks. This way, you can keep your account updated. For the step-by-step guide, you can refer to this article: Categorise online bank transactions in QuickBooks Online.

Additionally, I encourage you to reconcile your Standard Bank accounts every month. This will help you monitor your income, expenses and detect any possible errors accordingly. You can refer to this article for the complete details: Reconcile an account in QuickBooks Online.

Please keep me posted on how it goes in the comments below. Let me know if you have other banking concerns, and I'll be glad to help. Take care and have a good day.