Here is the MAME update file to upgrade from version 0.210 to version 0.211. This update file weighs about 500MB. The download link is at the bottom of the page.
Here is the MAME update file to upgrade from version 0.209 to version 0.210.This update file is quite large (1.69GB) because there are 5 CHD files: cdp-10002b.chd (85MB), gdx-0023.chd (45MB), r00.chd (887MB), 912kaaa02.chd (175MB) and 639aab01.chd (317MB)
Update July 09, 2019The downloads are available again Here is a list of bios required for the RetroArch v1.7.6 emulator with links to download them :