Swiss manager software

ChessManager definitely looks way more intuitive. Runs completely in your web browser so you don't have to download anything: https://admin.chessmanager.com

Another free chess tournament management system and FIDE approved Pairing Program is Tornelo https://tornelo.com/

I am using Swiss Manager Demo version, but i am getting the "Upload Tournament" as greyed out i cant use this feature can anyone help? Thank you.

Both use the JavaFo engine which FIDE recommends. Even though both systems are not FIDE endorsed per se, I never faced a problem and recommend both wholeheartedly.