diff --git a/deploy/FortFirewall.iss b/deploy/FortFirewall.iss
index a895831a..73603aa5 100644
--- a/deploy/FortFirewall.iss
+++ b/deploy/FortFirewall.iss
@@ -140,6 +140,35 @@ begin
   Result := (Version.Major > 10) or ((Version.Major = 10) and (Version.Build > 19040));
 end;
 
+function IsWindows7(): Boolean;
+var
+  Version: TWindowsVersion;
+begin
+  GetWindowsVersionEx(Version);
+  Result := (Version.Major = 6) and (Version.Minor = 1);
+end;
+
+function IsUpdateInstalled(KB: String): Boolean;
+var
+  UpdateSession: Variant;
+  UpdateSearcher: Variant;
+  SearchResult: Variant;
+  I: Integer;
+begin
+  UpdateSession := CreateOleObject('Microsoft.Update.Session');
+  UpdateSearcher := UpdateSession.CreateUpdateSearcher();
+  SearchResult := UpdateSearcher.Search('IsInstalled=1');
+  for I := 0 to SearchResult.Updates.Count - 1 do
+  begin
+    if SearchResult.Updates.Item(I).KBArticleIDs.Item(0) = KB then
+    begin
+      Result := true;
+      Exit;
+    end;
+  end;
+  Result := false;
+end;
+
 function HVCIEnabled(): Boolean;
 var
   EnabledValue: Cardinal;
@@ -292,6 +321,14 @@ begin
   begin
     SuppressibleMsgBox(ExpandConstant('{cm:NotCompatibleWithWindows}'), mbCriticalError, MB_OK, IDOK);
 
+    Result := False;
+    Exit;
+  end;
+#else
+  if IsWindows7() and not IsUpdateInstalled('4474419') then
+  begin
+    SuppressibleMsgBox(ExpandConstant('{cm:NotCompatibleWithWindows7}'), mbCriticalError, MB_OK, IDOK);
+
     Result := False;
     Exit;
   end;
diff --git a/deploy/languages/custom/BrazilianPortuguese.isl b/deploy/languages/custom/BrazilianPortuguese.isl
index bbbeb295..a242fd8d 100644
--- a/deploy/languages/custom/BrazilianPortuguese.isl
+++ b/deploy/languages/custom/BrazilianPortuguese.isl
@@ -14,5 +14,6 @@ UninstallPasswordOK=OK
 UninstallPasswordCancel=Cancel
 WrongPassword=Wrong password
 NotCompatibleWithWindows=This program is not compatible with Windows version (Windows 10 2004 or newer required).
+NotCompatibleWithWindows7=This program is not compatible with Windows 7 version (KB4474419 required).
 NotCompatibleWithHVCI=This program is not compatible with HVCI (Core Isolation).
 IsDeleteData=Delete config & data files?
diff --git a/deploy/languages/custom/ChineseSimplified.isl b/deploy/languages/custom/ChineseSimplified.isl
index 6c03d4ed..2b97f984 100644
--- a/deploy/languages/custom/ChineseSimplified.isl
+++ b/deploy/languages/custom/ChineseSimplified.isl
@@ -14,5 +14,6 @@ UninstallPasswordOK=È·
 UninstallPasswordCancel=È¡Ïû
 WrongPassword=ÃÜÂë´íÎó
 NotCompatibleWithWindows=This program is not compatible with Windows version (Windows 10 2004 or newer required).
+NotCompatibleWithWindows7=This program is not compatible with Windows 7 version (KB4474419 required).
 NotCompatibleWithHVCI=Õâ¸ö³ÌÐòÓëHVCI£¨ºËÐĸôÀ룩²»¼æÈÝ¡£
 IsDeleteData=ÄúÏ£Íûɾ³ýÅäÖÃÎļþºÍÊý¾ÝÎļþÂð£¿
diff --git a/deploy/languages/custom/Default.isl b/deploy/languages/custom/Default.isl
index a2a854eb..7cefb3ba 100644
--- a/deploy/languages/custom/Default.isl
+++ b/deploy/languages/custom/Default.isl
@@ -14,5 +14,6 @@ UninstallPasswordOK=OK
 UninstallPasswordCancel=Cancel
 WrongPassword=Wrong password
 NotCompatibleWithWindows=This program is not compatible with Windows version (Windows 10 2004 or newer required).
+NotCompatibleWithWindows7=This program is not compatible with Windows 7 version (KB4474419 required).
 NotCompatibleWithHVCI=This program is not compatible with HVCI (Core Isolation).
 IsDeleteData=Delete config & data files?
diff --git a/deploy/languages/custom/French.isl b/deploy/languages/custom/French.isl
index 395f73a7..766bb50c 100644
--- a/deploy/languages/custom/French.isl
+++ b/deploy/languages/custom/French.isl
@@ -14,5 +14,6 @@ UninstallPasswordOK=OK
 UninstallPasswordCancel=Cancel
 WrongPassword=Wrong password
 NotCompatibleWithWindows=This program is not compatible with Windows version (Windows 10 2004 or newer required).
+NotCompatibleWithWindows7=This program is not compatible with Windows 7 version (KB4474419 required).
 NotCompatibleWithHVCI=This program is not compatible with HVCI (Core Isolation).
 IsDeleteData=Delete config & data files?
diff --git a/deploy/languages/custom/German.isl b/deploy/languages/custom/German.isl
index a6182011..80da37f9 100644
--- a/deploy/languages/custom/German.isl
+++ b/deploy/languages/custom/German.isl
@@ -14,5 +14,6 @@ UninstallPasswordOK=OK
 UninstallPasswordCancel=Cancel
 WrongPassword=Wrong password
 NotCompatibleWithWindows=This program is not compatible with Windows version (Windows 10 2004 or newer required).
+NotCompatibleWithWindows7=This program is not compatible with Windows 7 version (KB4474419 required).
 NotCompatibleWithHVCI=This program is not compatible with HVCI (Core Isolation).
 IsDeleteData=Delete config & data files?
diff --git a/deploy/languages/custom/Italian.isl b/deploy/languages/custom/Italian.isl
index 3cb34667..78040b8c 100644
--- a/deploy/languages/custom/Italian.isl
+++ b/deploy/languages/custom/Italian.isl
@@ -14,5 +14,6 @@ UninstallPasswordOK=OK
 UninstallPasswordCancel=Cancel
 WrongPassword=Wrong password
 NotCompatibleWithWindows=This program is not compatible with Windows version (Windows 10 2004 or newer required).
+NotCompatibleWithWindows7=This program is not compatible with Windows 7 version (KB4474419 required).
 NotCompatibleWithHVCI=This program is not compatible with HVCI (Core Isolation).
 IsDeleteData=Delete config & data files?
diff --git a/deploy/languages/custom/Korean.isl b/deploy/languages/custom/Korean.isl
index 49df6fa2..e219237f 100644
--- a/deploy/languages/custom/Korean.isl
+++ b/deploy/languages/custom/Korean.isl
@@ -14,5 +14,6 @@ UninstallPasswordOK=OK
 UninstallPasswordCancel=Cancel
 WrongPassword=Wrong password
 NotCompatibleWithWindows=This program is not compatible with Windows version (Windows 10 2004 or newer required).
+NotCompatibleWithWindows7=This program is not compatible with Windows 7 version (KB4474419 required).
 NotCompatibleWithHVCI=This program is not compatible with HVCI (Core Isolation).
 IsDeleteData=Delete config & data files?
diff --git a/deploy/languages/custom/Portuguese.isl b/deploy/languages/custom/Portuguese.isl
index 5e8d57a7..29a3d0a1 100644
--- a/deploy/languages/custom/Portuguese.isl
+++ b/deploy/languages/custom/Portuguese.isl
@@ -14,5 +14,6 @@ UninstallPasswordOK=OK
 UninstallPasswordCancel=Cancel
 WrongPassword=Wrong password
 NotCompatibleWithWindows=This program is not compatible with Windows version (Windows 10 2004 or newer required).
+NotCompatibleWithWindows7=This program is not compatible with Windows 7 version (KB4474419 required).
 NotCompatibleWithHVCI=This program is not compatible with HVCI (Core Isolation).
 IsDeleteData=Delete config & data files?
diff --git a/deploy/languages/custom/Russian.isl b/deploy/languages/custom/Russian.isl
index 5c9ca594..baf8bddd 100644
--- a/deploy/languages/custom/Russian.isl
+++ b/deploy/languages/custom/Russian.isl
@@ -14,5 +14,6 @@ UninstallPasswordOK=OK
 UninstallPasswordCancel=Îòìåíà
 WrongPassword=Wrong password
 NotCompatibleWithWindows=Ýòà ïðîãðàììà íåñîâìåñòèìà ñ âåðñèåé Windows (òðåáóåòñÿ Windows 10 2004 èëè íîâåå).
+NotCompatibleWithWindows7=Ýòà ïðîãðàììà íåñîâìåñòèìà ñ âåðñèåé Windows 7 (òðåáóåòñÿ KB4474419).
 NotCompatibleWithHVCI=Ýòà ïðîãðàììà íåñîâìåñòèìà ñ HVCI (Core Isolation).
 IsDeleteData=Óäàëèòü íàñòðîéêè è ôàéëû äàííûõ?
diff --git a/deploy/languages/custom/Slovenian.isl b/deploy/languages/custom/Slovenian.isl
index 33ba9b27..d4b3330d 100644
--- a/deploy/languages/custom/Slovenian.isl
+++ b/deploy/languages/custom/Slovenian.isl
@@ -14,5 +14,6 @@ UninstallPasswordOK=OK
 UninstallPasswordCancel=Cancel
 WrongPassword=Wrong password
 NotCompatibleWithWindows=This program is not compatible with Windows version (Windows 10 2004 or newer required).
+NotCompatibleWithWindows7=This program is not compatible with Windows 7 version (KB4474419 required).
 NotCompatibleWithHVCI=This program is not compatible with HVCI (Core Isolation).
 IsDeleteData=Delete config & data files?