It seems that initially after installing the composer, the installation file has been deleted. This is the only reason you are getting the error.
As a workaround:
- uninstall View Composer Application 6.2.2 only from Program & Features ( NOTE: Do not remove or delete the Composer Database)
- Re-install View Composer Application 6.2.2 again pointing to the existing Composer Database. ( This will make sure you have the installer file)
There after you can perform the update.
NOTE: Even though Composer DB is not touch, please take a backup of the composer database prior performing the action plan.
If the above steps is helpful, please mark the answer as correct 