lost application

hi I’m new to linux , just started yesterday , I downloaded kodi last night icon appeared on the user panel and it worked great,put a nice community build on it then added a paid add on that i use , but this morning when i log back in , ( had trouble logging back in i cannot remember my user name and don’t know how or where to access it ) I must be logged in because my name is on home screen but i can’t find any of the DLs i did last night or this morning even notes i made in tomboy have disappeared , is this because i logged out or accidentally clicked ’ switch user " ?

Is there any chance you logged on as guest yesterday?

not sure what you mean ?
problem sorted , i was using linux live as op
posed to launched.