/usr/share/doc/nsis/Examples/one-section.nsi is in nsis-doc 2.51-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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;
; This example demonstrates how to control section selection.
; It allows only one of the sections of a group to be selected.
;--------------------------------
; Section define/macro header file
; See this header file for more info
!include "Sections.nsh"
;--------------------------------
Name "One Section"
OutFile "one-section.exe"
RequestExecutionLevel user
;--------------------------------
; Pages
Page components
;--------------------------------
; Sections
Section !Required
SectionIn RO
SectionEnd
Section "Group 1 - Option 1" g1o1
SectionEnd
Section /o "Group 1 - Option 2" g1o2
SectionEnd
Section /o "Group 1 - Option 3" g1o3
SectionEnd
Section "Group 2 - Option 1" g2o1
SectionEnd
Section /o "Group 2 - Option 2" g2o2
SectionEnd
Section /o "Group 2 - Option 3" g2o3
SectionEnd
;--------------------------------
; Functions
; $1 stores the status of group 1
; $2 stores the status of group 2
Function .onInit
StrCpy $1 ${g1o1} ; Group 1 - Option 1 is selected by default
StrCpy $2 ${g2o1} ; Group 2 - Option 1 is selected by default
FunctionEnd
Function .onSelChange
!insertmacro StartRadioButtons $1
!insertmacro RadioButton ${g1o1}
!insertmacro RadioButton ${g1o2}
!insertmacro RadioButton ${g1o3}
!insertmacro EndRadioButtons
!insertmacro StartRadioButtons $2
!insertmacro RadioButton ${g2o1}
!insertmacro RadioButton ${g2o2}
!insertmacro RadioButton ${g2o3}
!insertmacro EndRadioButtons
FunctionEnd
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