I haven't encountered any "failed to find steam" issue that everyone is suddenly having with adding the patch for steam.
Once you have opened the file with any of these software's 7-zip
Copy and paste
the files into the folder ""C:\Program Files (x86)\Steam\steamapps\common\Rome Total War Gold\RS2""
folder that was created in the steps above.
Once you have placed them in the folder a window will pop up, asking if you want to merge the folders
, make sure you click the box
"do this for all current items (28 found)
", then go on and click yes
After clicking yes you will get another window appear, here you must click the box
""Do this for the next 1405
conflicts"" then click Copy and Replace
Then simply go to your steam library and start the mod up, you should have an already made shortcut in the library from following the steps from the installation for steam users,
When the game has loaded start a new campaign and to tell if it's worked you will be able to tell from ending your turn, you will then get your new turn information, and the icons will be new. (I was in the Roman campaign, so I'm not sure if it's changed for every other faction.
If by any chance you do get the "Failed to find steam" simply go to the top left tab of which should be named "steam" in the drop down menu it will say exit. After it's exited re-open it and then try the mod again.