Made XPUI.nsh add the Plugin and Include directories relative to XPUI_SYSDIR to make detached installations work better.
; Ini file generated by the HM NIS Edit IO designer.
[Settings]
NumFields=2
State=0
[Field 1]
Type=Label
Left=0
Right=290
Top=17
Bottom=62
Text=Welcome to XXX Setup Wizard
[Field 2]
Type=Label
Left=0
Right=290
Top=68
Bottom=232
Text=This will install XXX on your computer, etc