Classic Android Promo Graphic Needed

I need a single promotional image that says, in clear wording, “Download the app – SAVE 15% OFF.” The app is Android-only, and I want the overall look to feel classic rather than modern or minimalist.

Essential elements
• A prominent, easy-to-tap Download button is a must.
• Everything else—icons, discount badges, extra flourishes—is optional; include them only if they enhance the classic aesthetic.

Please deliver the finished artwork in a high-resolution PNG or JPG plus the editable source file (PSD, AI, or similar) so I can tweak text or colors later if needed.