QuickBooks error 1935 is an installation error. It may occur either when you are in the middle of installing QuickBooks or when you try opening QuickBooks for the first time after installation. You will not be able to proceed with the installation or complete the registration and access the software if you get this error. The only way to get back to your accounting on QuickBooks is first to resolve the error. To do so, it is important to identify the main reasons why this problem would occur.