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)
Here are some CHD files, many are for the update of version 0.209 and 0.208 of MAME. You will also find the MD5 and CRC32 for each CHD file to better know if it is the right file for you.