diff --git a/Docs/src/history.but b/Docs/src/history.but
index fa859961..eddffbe5 100644
--- a/Docs/src/history.but
+++ b/Docs/src/history.but
@@ -14,6 +14,8 @@ Released on ??? ??th, 20??
 
 \b Added MUI_TEXTCOLOR setting
 
+\b Added LIBRARY_INSTALL_EQUAL_VERSION \R{library_install}{InstallLib} option
+
 \b Added NTMARTA to preload list to fix rare Windows 7 security issue (\W{http://sf.net/p/nsis/bugs/1204}{bug #1204})
 
 \b MakeNSIS prints -CMDHELP to stdout (\W{http://sf.net/p/nsis/bugs/1203}{bug #1203})
diff --git a/Docs/src/library.but b/Docs/src/library.but
index 8c186c4b..3c772bbb 100644
--- a/Docs/src/library.but
+++ b/Docs/src/library.but
@@ -131,6 +131,10 @@ The Windows temp directory could be located on any volume, so you cannot use thi
 
 \b Not recommended for DLLs installed to $SYSDIR.
 
+\S2{} LIBRARY_INSTALL_EQUAL_VERSION
+
+\b Define this before inserting InstallLib macro to overwrite the file even if the version is the same as the existing file.
+
 \S1{library_install_notes} Notes
 
 \b If you need to support Windows 9x/ME, you can only use short filenames (8.3).
diff --git a/Include/Library.nsh b/Include/Library.nsh
index 1d886563..06f72dda 100644
--- a/Include/Library.nsh
+++ b/Include/Library.nsh
@@ -146,6 +146,13 @@
 
 !macroend
 
+!macro __InstallLib_Helper_CmpPackedVer64 oldhi oldlo newhi newlo jeq jle jgt
+
+  IntCmpU ${oldhi} ${newhi} 0      ${jle} ${jgt}
+  IntCmpU ${oldlo} ${newlo} ${jeq} ${jle} ${jgt}
+
+!macroend
+
 ### Get library version
 !macro __InstallLib_Helper_GetVersion TYPE FILE
 
@@ -314,9 +321,13 @@
 
       !ifndef INSTALLLIB_LIBTYPE_TLB & INSTALLLIB_LIBTYPE_REGDLLTLB
 
-        IntCmpU $R0 $R2 0 "installlib.register_${INSTALLLIB_UNIQUE}" "installlib.upgrade_${INSTALLLIB_UNIQUE}"
-        IntCmpU $R1 $R3 "installlib.register_${INSTALLLIB_UNIQUE}" "installlib.register_${INSTALLLIB_UNIQUE}" \
-          "installlib.upgrade_${INSTALLLIB_UNIQUE}"
+        !ifdef LIBRARY_INSTALL_EQUAL_VERSION
+          !insertmacro __InstallLib_Helper_CmpPackedVer64 $R0 $R1 $R2 $R3 "installlib.upgrade_${INSTALLLIB_UNIQUE}" \
+            "installlib.register_${INSTALLLIB_UNIQUE}" "installlib.upgrade_${INSTALLLIB_UNIQUE}"
+        !else
+          !insertmacro __InstallLib_Helper_CmpPackedVer64 $R0 $R1 $R2 $R3 "installlib.register_${INSTALLLIB_UNIQUE}" \
+            "installlib.register_${INSTALLLIB_UNIQUE}" "installlib.upgrade_${INSTALLLIB_UNIQUE}"
+        !endif
 
       !else
 
@@ -328,15 +339,18 @@
 
         !ifndef LIBRARY_VERSION_NONE
 
-          IntCmpU $R0 $R2 0 "installlib.register_${INSTALLLIB_UNIQUE}" "installlib.upgrade_${INSTALLLIB_UNIQUE}"
-          IntCmpU $R1 $R3 0 "installlib.register_${INSTALLLIB_UNIQUE}" \
-            "installlib.upgrade_${INSTALLLIB_UNIQUE}"
+          !insertmacro __InstallLib_Helper_CmpPackedVer64 $R0 $R1 $R2 $R3 0 \
+            "installlib.register_${INSTALLLIB_UNIQUE}" "installlib.upgrade_${INSTALLLIB_UNIQUE}"
 
         !else
 
-          IntCmpU $R0 $R2 0 "installlib.register_${INSTALLLIB_UNIQUE}" "installlib.upgrade_${INSTALLLIB_UNIQUE}"
-          IntCmpU $R1 $R3 "installlib.register_${INSTALLLIB_UNIQUE}" "installlib.register_${INSTALLLIB_UNIQUE}" \
-            "installlib.upgrade_${INSTALLLIB_UNIQUE}"
+          !ifdef LIBRARY_INSTALL_EQUAL_VERSION
+            !insertmacro __InstallLib_Helper_CmpPackedVer64 $R0 $R1 $R2 $R3 "installlib.upgrade_${INSTALLLIB_UNIQUE}" \
+              "installlib.register_${INSTALLLIB_UNIQUE}" "installlib.upgrade_${INSTALLLIB_UNIQUE}"
+          !else
+            !insertmacro __InstallLib_Helper_CmpPackedVer64 $R0 $R1 $R2 $R3 "installlib.register_${INSTALLLIB_UNIQUE}" \
+              "installlib.register_${INSTALLLIB_UNIQUE}" "installlib.upgrade_${INSTALLLIB_UNIQUE}"
+          !endif
 
         !endif
 
@@ -377,9 +391,13 @@
         Pop $R3
         Pop $R2
 
-        IntCmpU $R0 $R2 0 "installlib.register_${INSTALLLIB_UNIQUE}" "installlib.upgrade_${INSTALLLIB_UNIQUE}"
-        IntCmpU $R1 $R3 "installlib.register_${INSTALLLIB_UNIQUE}" "installlib.register_${INSTALLLIB_UNIQUE}" \
-          "installlib.upgrade_${INSTALLLIB_UNIQUE}"
+        !ifdef LIBRARY_INSTALL_EQUAL_VERSION
+          !insertmacro __InstallLib_Helper_CmpPackedVer64 $R0 $R1 $R2 $R3 "installlib.upgrade_${INSTALLLIB_UNIQUE}" \
+            "installlib.register_${INSTALLLIB_UNIQUE}" "installlib.upgrade_${INSTALLLIB_UNIQUE}"
+        !else
+          !insertmacro __InstallLib_Helper_CmpPackedVer64 $R0 $R1 $R2 $R3 "installlib.register_${INSTALLLIB_UNIQUE}" \
+            "installlib.register_${INSTALLLIB_UNIQUE}" "installlib.upgrade_${INSTALLLIB_UNIQUE}"
+        !endif
 
         !undef LIBRARY_VERSION_HIGH
         !undef LIBRARY_VERSION_LOW
@@ -392,7 +410,7 @@
 
     !endif
 
-  !endif
+  !endif ;~LIBRARY_IGNORE_VERSION
 
   ;------------------------
   ;Upgrade