You’re still doing it wrong. In order to find out what the correct packages are, you must go to the sites that contain them. Those sites are located here and here.
And since you’ve already got your browser open then, you can skip the curl commands and just download the two pertinent packages by way of your browser. 
manjaro-keyring-20230719-3-any.pkg.tar.zst
archlinux-contrib-20240714-1-any.pkg.tar.zst
If you do want to use the curl commands instead of directing your browser to those repositories and looking for the packages, then the commands will be…
curl -O manjaro-keyring-20230719-3-any.pkg.tar.zst
curl -O archlinux-contrib-20240714-1-any.pkg.tar.zst
Lastly, please take out the time to read this short but informative essay…