Unlock other heroes in knockout/standart private lobbies

[Worldspawn]

Is there any way to do that? I was looking through console commands, but nothing useful.

I usually play in private lobbies with my friends + bots, but we are tired of the same characters pool. We miss Morphling, Bloodseeker, Ogre Magi etc..

Maybe there is a way to modify gamefiles or download older version of the game?
If older versions, then how are we going to connect to private lobbies?

[󠀡⁧⁧󠀡]

https://www.reddit.com/r/Steam/comments/611h5e/guide_how_to_download_older_versions_of_a_game_on/

GL