[LyX/master] Wininstaller, fix bug where previous installations, with emergency version greater than 1, could not be seen in registry on overinstall

[Eugene Chornyi]

commit 32e501a282a3c9e83181979c32bf9b9cde79e43f
Author: Eugene Chornyi <yu_jin at lyx.org>
Date:   Tue Jul 7 21:13:34 2020 +0200

    Wininstaller, fix bug where previous installations, with emergency version greater than 1, could not be seen in registry on overinstall
---
 .../Win32/packaging/installer/include/init.nsh     |    8 ++++++--
 1 files changed, 6 insertions(+), 2 deletions(-)

diff --git a/development/Win32/packaging/installer/include/init.nsh b/development/Win32/packaging/installer/include/init.nsh
index 76bacd5..bdbb495 100644
--- a/development/Win32/packaging/installer/include/init.nsh
+++ b/development/Win32/packaging/installer/include/init.nsh
@@ -660,13 +660,17 @@ Function .onInit
     ReadRegStr $0 HKLM "Software\Microsoft\Windows\CurrentVersion\Uninstall\${APP_NAME}${APP_VERSION_MAJOR}${APP_VERSION_MINOR}$5" "DisplayVersion"
     # also check for an emergency release
     ${if} $0 == ""
-     ReadRegStr $0 HKLM "Software\Microsoft\Windows\CurrentVersion\Uninstall\${APP_NAME}${APP_VERSION_MAJOR}${APP_VERSION_MINOR}$51" "DisplayVersion"
+     ${For} $7 0 20
+      ReadRegStr $0 HKLM "Software\Microsoft\Windows\CurrentVersion\Uninstall\${APP_NAME}${APP_VERSION_MAJOR}${APP_VERSION_MINOR}$5$7" "DisplayVersion"
+     ${Next}
     ${endif}
    ${else}
     ReadRegStr $0 HKCU "Software\Microsoft\Windows\CurrentVersion\Uninstall\${APP_NAME}${APP_VERSION_MAJOR}${APP_VERSION_MINOR}$5" "DisplayVersion"
     # also check for an emergency release
     ${if} $0 == ""
-     ReadRegStr $0 HKCU "Software\Microsoft\Windows\CurrentVersion\Uninstall\${APP_NAME}${APP_VERSION_MAJOR}${APP_VERSION_MINOR}$51" "DisplayVersion"
+     ${For} $7 0 20
+      ReadRegStr $0 HKCU "Software\Microsoft\Windows\CurrentVersion\Uninstall\${APP_NAME}${APP_VERSION_MAJOR}${APP_VERSION_MINOR}$5$7" "DisplayVersion"
+     ${Next}
     ${endif}
    ${endif}
    ${if} $0 != ""