Step 1

For Notepad++  v7.5 and earlier:
copy the dll to %PROGRAMFILES(x86)%\ Notepad++\ plugins\
For Notepad++ v7.6
copy the dll to %LOCALAPPDATA%\ Notepad++\ plugins\ SQLinFormNpp64\
For Notepad++ v7.6.1
copy the dll to %PROGRAMDATA%\ Notepad++\ plugins\ SQLinFormNpp\

Step 2

For Notepad++  v7.5 and earlier
copy the dll to %PROGRAMFILES%\ Notepad++\ plugins
For Notepad++ v7.6
copy to %LOCALAPPDATA%\ Notepad++\ plugins\ SQLinFormNpp64\
For Notepad++ v7.6.1
copy the dll to %PROGRAMDATA%\ Notepad++\ plugins\ SQLinFormNpp64\

Step 3

Start Notepad++. Go to the Plugin menu and there you will find the SQLinForm menu item.

Enter the license info and click Registrate! Restart Notepad++

Step 4

Format and Beautify your SQL Statements with ALT+F. You can switch on the live formatting feature in the SQLinForm Options Dialog. While playing around with the 70+ options you can switch on the live preview feature to see immediately the impact of the new formatting style in your SQL.