When can us download the ROM file (*.gba) or the IPS file (*.ips) formally?
I HOPE THAT THERE WILL BE A DOWNLOAD LINK APPEARS IMMEDIATELY!!!!!!
The ROM name is found in the hack's page:
* Super Mario Advance 4 - Super Mario Bros. 3 (USA, Australia) (Rev 1)
Simply run a Google search for that and download the ROM from a page with the result.
As for the IPS, go to ZeBucket and search for the word "SuperMarioAdvance4" and you will find the .rar file with the IPS and xdelta patches.