As the previous MediaFire link seems to be dead, I've zipped and uploaded all the scenarios and their readmes from the wayback site.

Here they are: http://www.mediafire.com/?xx1plfci9y3ezxi

Thank you! I think these sorts of things add more value to a game than the folders of artwork, fan fiction comics, dev team interviews and the like that are included as extras with many of these titles.

You can get some user add-ons here, as well: http://netd.sklabs.ru/

The address in the OP does not work anymore.

For Disciples 2
http://web.archive.org/web/20101205104524/http://www.disciples2.com/D2/downloads/ListFiles.asp?iFileTypeID=6
For Disciples 1 you can find yourself, just use the link from fisrt post. But for first Disciples most scenarios not downloaded from Web.Archive. Strategy First have few different urls for downloading - must do manually search each

Strange... first i opy link from steam with steamlink filter. GOG skip steamcommunity domen. OK. But why it happened also for web.archive? It work early.

Sadly, NONE of the links above seem to work.

My link is work - just forum bug. Copy url to addressbar.

links are hacked and redirecting to japan casino, DO NOT use them!!!

Ссылки рабочие. Верните аккаунт владельцу, который его регал в GOG в 2016 году. Тот кто в GOG 3 года не удивлялся бы очередным багам кривого форума.

try for yourself , i am never clicking on links, only copy-pasting text in the address bar
http://www.disciples2.com/D1/dld/scenarios.html redirects to http://www.disciples2.com/bsj.html!

For Disciples 2
http://web.archive.org/web/20101205104524/http://www.disciples2.com/D2/downloads/ListFiles.asp?iFileTypeID=6
For Disciples 1
http://web.archive.org/web/20101203085900/http://www.disciples2.com/D1/dld/scenarios.html
but files itself must be downloaded from strategy first files site archive, using differ urls - sf.ca/files, sf2.ca/files or strategyfirst.com/files/ - something like that. Files for D2 can be downlaoded directly from link above.
Something like that but for D1
http://www.strategyfirst.com/en/games/D2Gold/downloads/#Downloads461
Unfortunately files site mostly not archived, eg
http://strategyfirst.com/app/webroot/files/maps/D2-The_Great_War.zip

nevendaar.com or maybe some others sites (archive of netd http://netd.sklabs.ru/ ?) have ziped archives of all maps from that site. Some torrents even have all that unofficial maps for D1. rutracker (req. registration) have some all maps\saga\addons torrents.