When you are trying to enter in your Quicken you may encounter Quicken an unknown Error occurred due to internet connection. If your internet connection is slow, then surely you will not be able to access your Quicken with your username and password. You don’t need to worry! This is a temporary error coming due to the slow internet server and can only be resolved automatically by reconnecting the internet connection.  If you are still facing the error then go through the blog and you will get the solution for it. And request you to read this blog very carefully before applying the step because any wrong step will lead you to the problem of data loss.

The reason behind Quicken an unknown error occurred.


Due to several factors listed below, such an error appears:

  • Slow internet or unstable internet.
  • Older version of Quicken.
  • Problems occur due to improper installation of Quicken.

First, you need to find the exact problem behind “Quicken an unknown error occurred”

You can also check Quicken Online Service Unavailable!

How to install Quicken updates?


Before installing the latest version of Quicken we first need to uninstall the older version of Quicken.

Uninstall Quicken for Windows 10: – Quicken an unknown error occurred


For that first, you need to stop all the running programs. After that, you need to open the run box. You will get it from the menu. In the run box, you have to type “Appwiz.cpl”. And then you have to click on OK. Then you will see a new window open. And in the new window, you see a list of items there you need to find Quicken. From there you can uninstall the older version of Quicken. Once the uninstallation is complete then you need to download QcleanUI from the Quicken website. Now you need to install QcleanUI and there you need to select all the default value. After the installation, you have to run it.

You can also check Quicken Error CC-502!

Quicken Online Backup!

Quicken Online backup is very important in terms of securities and the safety of data. In any scenario, no one wants to lose their data. But many customers take backup but in offline. But you’d better take the Backup of you Quicken Data otherwise we are not response-able for any loss of data. Because data is the backbone of any industry. So,  This is our request to take an online backup of your data. And if you don’t know how to take an online backup then you can check out our blog.- “Quicken an unknown error occurred”

Once the QcleanUI deletes all the program files that are related to Quicken. The go-to the Quicken website and download the latest version of Quicken. And make sure that the firewall of your computer is in the off state. Now you need to install Quicken with the default values. Then you need to open Quicken as a single user. And now you need to enter Quicken ID and the password.

You can also check quicken error ol-221-a!

Uninstall Quicken for Windows 8:

For Windows 8 users, you need to follow the given steps:

  • Uninstallation of Quicken very important for resolving Quicken an unknown error occurred.
  • Press and hold the Windows + letter R keys from your keyboard.
  • Type Control Panel in the Run box and click on OK.
  • Now, click on “Programs” and then click on “Programs and Features”.
  • In the list of Apps. There you see an option with the name of “Quicken” and click on it.
  • After that, click on the “Uninstall” option by the right click on the Quicken option.
  • And then click on all the positive options like OK, allow, or Yes for the confirmation.
  • Now, you have to wait until the complete uninstallation.
  • And you need to install QcleanUI to delete all patch files related to Quicken Accounting Software. In order to download Quicken QcleanUI then you need to search for it on google > then you have to click on the first option.
  • If you don’t know how to run QcleanUI you can check out over blog. Basically, QcleanUI is developed for deleting the program files. It’s very important because if there is any file left from the older version of Quicken it might create problem for the new version.

You can also check Quicken error code cc 501!

Quicken an unknown error occurred - Infographic

Uninstall Quicken for Windows 7: – Quicken an unknown error occurred


Go through the given instructions if you have the Windows 7 operating system. First of all, turn off of all the protections of your computer and then follow the given instructions:


  • Click on the “Start” icon
  • Now, type Run under the Search program and files and then press “Enter”
  • After type “Control Panel” in the box Run dialog box and press “OK”
  • Click on the “Programs” option and choose the “Quicken” from the given list
  • Press on the “Quicken” option
  • Now, from the top menu bar click “Uninstall”
  • And then tap “Yes” to confirm
  • Now, follow the on-screen instructions in a right-way
  • Uninstallation of Quicken very important for resolving Quicken an unknown error occurred.

Microsoft has stopped giving support for the windows 7 operating system. So, you’d better take a support plan if you are using Windows 7 operating system. Due to this reason, we are also not able to provide you the support for it

Installation of the latest version of Quicken:

Installation quicken for windows 10 is very easy you just need to click on all the positive options. 

Before installation, make sure that your computer’s firewall is turned off and that your computer is connected to a stable Internet connection.

First of all, you need to go to the Quicken website and log in there with your Quicken ID and password. Now you have to click on the download. After complete installation open Quicken as an administrator. Then enter your Quicken ID and the password. I hope your problem is resolved. But if you still facing the problem Quicken an unknown error occurred then checkout solution 2 for the same. Or you can chat with us through Facebook.