Glad you enjoyed the trip down Memory Lane!
Nothing was lost. Everything it downloaded is saved in %LOCALAPPDATA%\AHStats\ahstats.db (paste %LOCALAPPDATA%\AHStats into the Explorer address bar to see it). Just run the exe again, type your ID in the same box and press Sync Full History. It already has the old tours, so it only checks the current one and it's done in seconds, not the long first download.
If you want a copy outside the app, every grid has an export, and there's a full HTML report too.