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Unfortunately you have run into a classic bug\error. Please follow these steps to solve that issue:

1.) Start 25Assist Application
2.) If 25Assist ask you again to "Find" or "Download" the game, please click on "Find". 25Assist will for sure not find the game. Ignore this.
3.) Go to Settings-Tab (left side menu)
4.) Change the Download-Server from "SourceForge.net" to "AAO25.com"
5.) Close the 25Assist
6.) Start the 25Assist
7.) 25Assist will ask you for "Find" or "Download". Now click on "Download"

Why this bug happens ?
Unfortunately the binaries on the "SourceForge.net" are not complete. The system folder of the game is empty after download, leading to the error "Not found". By selecting "AAO25.com" as Download-Server all binaries of the game will be downloaded correctly.