Simply place the .asi inside C:\Users<name>\Lexis<game>\scripthook, and any additional files inside the GTAV directory (we currently don't support .NET mods).
You can find the Lexis folder at
C:\Users\<name>\Lexis\.
We have a list of AI generated translations available here.
Currently there's a primary config created by Lexis and saved every two minutes, which will reload any options states on next launch. To remove this, delete C:\Users<name>\Lexis<game>\configs\default.json.