The phrase "allow it to complete" is correct and usable in written English.
You can use it when referring to giving permission for a process or task to finish or conclude.
Example: "Please be patient and allow it to complete before making any further changes."
Alternatives: "let it finish" or "permit it to conclude."
Sony said the acquisition of the stake would allow it to complete its array of devices, which includes game players, tablet and laptop computers and televisions.
The agreement with Telewest's main banks will also allow it to complete a plan to hand bondholders control in return for £3.5 billion ($5.4 billion) of debt.
Now the developer, a division of the Gencom Group, is seeking new financing that would allow it to complete the renovation.
Run the software and allow it to complete.
Like other banks, Goldman turned to synthetic C.D.O.'s to allow it to complete deals faster than the sort of mortgage securities that required actual mortgage bonds.
In August 2010, Valve postponed the release to February 2011, with a Steam release date of February 9, to allow it to complete changes to the game's dialogue, to fill and connect about sixty test chambers, and to finish refinements to the gel gameplay mechanic.
Again, the host has taken control of its senses – turning the gammarid into a zombie and allowing it to complete its life cycle by being eaten by a bird.
In this architecture, an event dispatcher assigns an event to an event handler and allows it to complete the event.
Once you are up and running in safe mode, open your anti-spyware program and allow it to run a complete scan, thus allowing it to remove any last traces of infections found.
Allow it to restart in order to complete installation.
Turn off the lathe and allow it to come to a complete stop before leaving the machine.
