The Linux packages for Slicer 5.6 and 5.7 are corrupt in the download page. This also reflects in the AUR packages that builds upon these.
What do you mean by corrupted? Cannot be unzipped?
Apparently I was having a download issue and the packages were incompletely downloaded. This happened in several browsers and in the AUR script. Today I have tested again and everything seems to be working.
Thanks for the update. In case of show/unstable network connection, downloads may fail due to http range requests not handled properly by the download server - maybe you have run into this yesterday.