All PowerPoint or Keynote templates published on MakePowerPoint.com can be used for free unless there is a separate copyright and usage instructions. You can use them for commercial and noncommercial purposes. You do not need to ask permission from or provide credit to the author or MakePowerPoint.com, although it is appreciated when possible.
More precisely, MakePowerPoint.com grants you an irrevocable, nonexclusive copyright license to download, copy, modify, distribute, perform, and use photos from MakePowerPoint.com for free, including for commercial purposes, without permission from or attributing the author or MakePowerPoint.com. This license does not include the right to compile templates from MakePowerPoint.com to replicate a similar or competing service.