QB Issue Resolution:

1603 error is a possible .NetFramework problem which is one of the Microsoft components and is required to be installed on your computer for QuickBooks. Since you’re having problem re-installing your QuickBooks version because of this error, please use the QBInstall tool first and check if this will help us fix the error. Please download the tool from this article:

http://support.quickbooks.intuit.com/support/Articles/HOW20636

I hope this will work. Will wait for your reply again.

Resolution for Issue 'Upgrading QuickBooks Database Manager on server' available: Yes (Solved).
Source: Intuit Community forum.

Upgrading QuickBooks Database Manager on server: this issue or error code is a known issue in Quickbooks Online (QBO) and/or Quickbooks. Support for this issue is available either by self-service or paid support options. Experts are available to resolve your Quickbooks issue to ensure minimal downtime and continue running your business. First try to resolve the issue yourself by looking for a resolution described below. If it is a complex issue or you are unable to solve the issue, you may contact us by clicking here or by using other support options.

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