maybe in the config - like all other settings too
.
Are you using twg admin? if yes,
simply paste
$open_download_in_browser=false;
in the additional field in the twg admin on the config page on the last tab and save it.
On the additional tab is a link to the website too where all possible settings are explained too - in the admin are only the important ~ 50. TWG has a lot of more thing to configure
.
on your local maching you can look into the config.php too - there are all options available - but you should never change something there - changes have to be made either by the twg admin interface or by copying the parameter vrom the config.php to the my_config.php and change it there (This is described in the readme and the website as well!).
Never make changes in the my_config.php and then use the twg Admin. Just decide where you want to make your settings !
Have fun using TWG,
Michael
/Michael