Hello, mamedoo.

We always want to ensure our software is up and running after every update. I'll take this opportunity to turn the tables around and help you out. 

I have some steps you can do to help you resolve the password issue for invoicing. I'll also give some details regarding our support plans. 

Before we start, let's make sure you have the latest patch for QuickBooks Desktop. This ensures you have all the latest critical fixes for issues like this. 

The email password might have something to do with the Send Forms settings. To fix this, verify the settings in your Preferences: 

1. Go to the Edit menu, then choose Preferences.
2. Click the Send Forms tab.
3. Under My Preferences, tick Web Mail, then highlight the email ID.
4. Click the Edit button.
5. Check or correct the Server Details.
6. Once done, click OK.

You can also delete and recreate the email ID. Simply highlight it again, then hit the Delete button. Set up your email settings and try sending an invoice again. 

There are also other ways to fix this issue. I'd recommend following the steps in this article: Fix webmail password issues in QuickBooks Desktop.

Also, we have support plans for QuickBooks Desktop but we don't have those kinds of pricing you mentioned. You can find our official Care Plan offerings here: Care Plans for QuickBooks Desktop Pro, Premier, and Mac.

Lastly, ensure you've contacted our official support channels. You can use this article for the steps on how to reach us: Contact QuickBooks Desktop support.

You can visit our QuickBooks Desktop articles if you need help with other tasks. We've published guides such as customer and vendor management, and how to create sales and expense forms. 

You're free to visit this thread again if you have other questions with QuickBooks Desktop. My colleagues and I will be here to help.