To deactivate an Account
Go to Tools > Account List. Click Edit for the account you need to change. Click Online Services tab. If the account has been activated for Online Bill Payment, deactivate this service first. Click Deactivate button in Online Setup box. Repeat for any other accounts that need to be deactivated. Restart Quicken to make sure that the changes are fully applied.
To (re-)activate accounts for downloading
Create a backup of your Quicken data file. This is will give you a restore point, should something go horribly wrong during the next steps. If you normally automatically accept downloaded transactions into your registers I recommend you turn this feature off now. The first transaction download after every activation will download 60 - 90 days worth of transactions into your account(s). Auto-accepting them will most likely create a horrible mess that's difficult to undo. You're better off manually reviewing and accepting or deleting this first batch of downloaded transactions, one by one. Go into Edit / Preferences / Downloaded Transactions. Remove the checkmarks from both "After downloading transactions" settings. Go to Tools / Add Account to reactivate the accounts. As you go thru the setup process, Quicken will identify all accounts it can download. Select an account type, e.g. Checking Enter the name of your bank and click Next. Some banks have multiple choices, Consumer vs. Business accounts, Express Web Connect vs. Direct Connect. Be sure to pick the correct one. Enter your credentials, select Save this password (if using password vault) and click Connect.
You should now see a list of all accounts found at your bank that you can activate. If you are activating an existing account, make sure the dropdown button for that account says LINK. If it says ADD, change it to LINK and select the correct Quicken account. If it already says LINK, click the button and select the correct existing account register. If you do not do this, then the account will be added as a new account instead of being linked to the existing account register.
Repeat this step for each account listed. Change ADD to IGNORE for any account on the list that you do not want to activate at this time. You can always come back and activate more accounts later. Click Next to continue.
mmeisler said: I actually did the other day. The Support person did share my screen. He had me repeat the same steps repeatedly while insisting the response would be different. It wasn't. He then told me it was a problem on the end of the financial institution which it clearly wasn't because it didn't even get to the point of connecting with them. But he told me to contact them. It was a useless call. Fortunately I tried one more thing on my own and figured it out.