Patch Error: Unable to check for updates, the server file failed to load
"Index and length must refer to a location within the string. Parameter name: length"
This error occurs when trying to install a patch downloaded from the Quicken Support website (ex: a Mondo Patch update).
To resolve this issue
You will need to create a new administrator user on your Windows system, and then install the patch with that new admin user.
Follow the steps below for your operating system. When creating the new administrator user, make sure there are no spaces in the username.
If you have any issues with this process, please contact Microsoft support.