Please use Photoshop otherwise you will be severely limited. I assume everyone who purchase this to have it, that is the main source for this project, since from there you can edit and remix and make it fit to your specific game UI needs. I have arranged it simply to show as an example what you can do with these elements and use them in creative ways.
PS: You can get a free trial of PS by Adobe or just use their Photography plan for 9$/m. It's the cheapest and best way. I use that very same plan.