Unfortunatly not! The works of Marcel Dupré can not yet be published on Musicalion. Dupré died in 1971. First 70 years after his death, after 2041, we no longer need the consent of the (former) rights holders. Here it is probably ALPHONSE LEDUC EDITIONS MUSICALES.

If you see such works published in the classical field elsewhere, then you can assume that such works are published illegally, if they are not from publishers. This is also dangerous for the music setter if we were to publish this. You may use that settings for your private purpose, but you should not publish it.

The simple formula is: The composer should have died more than 70 years ago, or you have the dedicated consent of the copyright holder.