No! 1.1.3 is very outdated!
You can get 1.2.1 AppImage for Linux:
https://lmms.io/download#linux
Back your own stuff up before you uninstall old 1.1.3
Current manual is not for 'a system' it is valid for all, but some features will be described OS-dependant -Like WINE in Linux.What is the latest Manual Version for my system ?
https://lmms.io/wiki/index.php?title=Manual
No, its the link i gave you :)Is the Manual Inside LMMS ?