curl -o paper.jar https://api.papermc.io/v2/projects/paper/versions/1.21.4/builds/latest/downloads/paper-1.21.4-latest.jar If you actually meant (for image processing), that requires a license from IDRSolutions — no public direct download.
I understand you're looking for a JAR file related to "JDeli" (a Java image library) and mentioned "paper" — likely referring to the server software for Minecraft. jdeli jar download
Could you clarify which one you need? If it's for PaperMC, the above links are correct and safe. curl -o paper