This problem occurs in NSIS 2.24, 2.23 did not have this particular problem.
On the license page I have added 2 radiobuttons to agree and not to agree. The default is not agree. However if you don't do anything on the page just press enter you are able to continue with the install.
I have tried:
!define MUI_LICENSEPAGE_RADIOBUTTONS
!insertmacro MUI_DEFAULT MUI_LICENSEPAGE_RADIOBUTTONS_TEXT_ACCEPT "I &accept this agreement"
!insertmacro MUI_DEFAULT MUI_LICENSEPAGE_RADIOBUTTONS_TEXT_DECLINE "I &do not accept this agreement"
!insertmacro MUI_PAGE_LICENSE "..\..\..\COPYING"
and:
LicenseForceSelection radiobuttons "I &accept this agreement" "I &do not accept this agreement"
!insertmacro MUI_PAGE_LICENSE "..\..\..\COPYING"
Both exhibit the same problem for NSIS v2.24
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user_id=584402
Originator: NO
Already fixed according to bug #1664428. Thanks.