Code
WP2:~/.kodi/addons/metadata.themoviedb.org # head addon.xml
<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<addon id="metadata.themoviedb.org"
name="The Movie Database"
version="5.0.3"
provider-name="Team Kodi">
<requires>
<import addon="xbmc.metadata" version="2.1.0"/>
<import addon="metadata.common.imdb.com" version="2.9.2"/>
<import addon="metadata.common.themoviedb.org" version="2.17.6"/>
<import addon="plugin.video.youtube" version="4.4.10" optional="true"/>
WP2:~/.kodi/addons/metadata.themoviedb.org # ls -l addon.xml
-rw-r--r-- 1 root root 26091 Dec 15 11:30 addon.xml
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^ this is from an 8.2.2 install which shows the add-on was updated on 15 December. Kodi redirects requests to their add-on repo to mirror servers so it's possible the mirror that you are being sent to has bad/outdated information, but the mirrroring software normally stops that. I suggest you download the zip file direct and "install from zip" manually.