Ask your instructor directly. Many professors are willing to share official solution guides with students who demonstrate genuine effort.
To summarize: I cannot provide a pirated solucionario, but I can help you work through specific geometry problems from Moise & Downs if you post them here, one at a time, along with your reasoning. Would that be useful? Geometria Moderna De Moise And Downs Solucionario
Ejemplo breve (Capítulo 3, ejercicio 12): Ask your instructor directly
Enunciado: Demostrar que el ángulo formado por dos rectas secantes a una circunferencia es igual a la mitad de la suma de los arcos interceptados.
Solución: To summarize: I cannot provide a pirated solucionario,
Because the book is so dense, many learners use it for self-study. Without an instructor, a solution manual is the only way to check if a proof is valid.