Voici les instructions pour prolonger la vie de Flash.

This are the step for IE11:

1. Do not install this optional update KB4577586: https://www.catalog.update.microsoft.com/search.aspx?q=4577586
2. When KB4577586 will be distributed, still do not install it. It will delete Flash for IE11 and will prevent it to be installed again
3. Be sure to have the latest Flash version: 32.0.0.445: http://www.catalog.update.microsoft.com/search.aspx?q=4580325
4. Create the following files:
   %windir%\System32\Macromed\Flash\mms.cfg
   %windir%\SysWOW64\Macromed\Flash\mms.cfg
5. Put this line of text in those files:
   EnableAllowList=1
   AllowListRootMovieOnly=1
   AllowListUrlPattern=https://%FQDN1%:%PORT%
   AllowListUrlPattern=http://%FQDN2%:%PORT%
   AllowListUrlPattern=http://%FQDN3%:%PORT%
   SilentAutoUpdateEnable=0
   AutoUpdateDisable=1
   EOLUninstallDisable=1
6. This will allow Flash to run on the AllowListUrlPattern  website after EOL date
7. If you use this procedure before EOL (now for example), all URL but those in the file will not work.

Source : https://www.adobe.com/content/dam/acom/en/devnet/flashplayer/articles/flash_player_admin_guide/pdf/latest/flash_player_32_0_admin_guide.pdf

Pour l'étape 5, on replace %FDQNxx%:%PORT% par l'url du serveur InfoBurst et le port 8551.

Et on ajoute autant de lignes que de serveur ou URL.

!! bien fermer IE s'il était ouvert avant la création des fichiers !!

La solution a été testé et fonctionne avec IE11 et IB < 240 et 240.