if you cannot make it yourself, maybe retrostudio is the way. all mods don't even work anymore, but hey, retrostudio has early 2012-mid 2015.
A multi-version ROBLOX client launcher built to allow the user to run LAN and Internet servers. · By
Well, theres a another way to get 2012, but, its only the studio version,
The website i found it on also has the 2013 client, if ya willing to go extra.
here: http://www.mediafire.com/file/5kk2as5b76cx2f5/ROBLOX_2008-2013.zip/file
There is a new "revival" that haves clients from 2007E-2018E called RBOLOCK:https://gamejolt.com/games/rbolock/651727 and the clients are modified for loading animations and all that stuff, even you can edit your avatar