See here for the main entry on FL Studio registration. This entry shows how to allow all accounts on a Windows computer to see and use FL Studio.
The default FL Studio installation will register the program for the current Windows user. Registering FL Studio for all Windows users is also possible (in FL Studio 7 and higher).
For the boxed version of FL Studio, simply select "Install for all users" during installation.
For the downloadable version of FL Studio, follow these Instructions:
1. Download and install the FLRegkey.Reg activation file on the pc.
2. Download and install the FL Studio demo installer file.
3. Make sure to check the "install for all users" option in the FL Studio installer window (see the image below)
4. FL Studio installer will now make the already available registration codes available to all Windows users.
Attention! Installing the FLRegkey.Reg file first is of vital importance to make the procedure work. Double click it or right-click and select 'Merge' to install it into your registry.
This is the Install for all users option:
The FL Studio Support Team