There have been several solutions posted on the Internet for solving the issue of getting uploaded administrator-approved InfoPath forms ‘unstuck’ from either the ‘Installing’ or ‘Upgrading’ status, but unfortunately, none of those solutions helped me solve my problem, which is why I’m writing about what truly did the trick for me.
When you upload an administrator-approved InfoPath form template to SharePoint, SharePoint automatically creates a Solution Package for it as well as a Timer Job.
Timer jobs are scheduled for execution, but sometimes it can take a long while before a SharePoint timer job gets executed.
If you have checked that there aren’t any SharePoint Timer services errors in the Windows event log, chances are great that the job is just waiting to be executed. You can check whether a job has been executed via the Central Administration > Operations > Timer Job Defintions page and clicking on the timer job for your InfoPath form template.
The timer job created by SharePoint would have a Title similar to Windows SharePoint Services Solution Deployment for “form-[your_uploaded_form_template_name].wsp”. The Schedule Type for this timer job would be One-time.
If you want to hurry the execution of administrative timer jobs along, you can use the following stsadm command:
stsadm -o execadmsvcjobs
This command executes all administrative timer jobs immediately instead of waiting for the timer job to run.

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