If your "download" interest is for flight simulators rather than physical modeling, this site provides a Fieseler Fi 156 Storch mod for Microsoft Flight Simulator (2020/2024). About the Aircraft
A major resource for vintage model plans; you can find a 1/4 scale Fieseler Fi 156C-1 plan that includes original German documentation. Download WHM 1802 Fiesler 156 Storch rar
If you are looking for this specific RAR or similar high-quality model airplane plans, they are available on several specialized repositories: If your "download" interest is for flight simulators