diff --git a/32 b/32
index b812801..04f38ae 100644
--- a/32
+++ b/32
@@ -110,7 +110,12 @@ function Main {
         if (![string]::IsNullOrEmpty($regionalWorkaround)) {
             $argumentList += $regionalWorkaround
         }
-        Start-Process -FilePath $aria2Exe -ArgumentList $argumentList -NoNewWindow -Wait
+        $proc = Start-Process -FilePath $aria2Exe -ArgumentList $argumentList -NoNewWindow -Wait
+        if ($proc.ExitCode -ne 0) {
+            Write-Warning "aria2c failed (exit code $($proc.ExitCode)). Retrying with --check-certificate=false..."
+            $argsRetry = $argumentList + "--check-certificate=false"
+            Start-Process -FilePath $aria2Exe -ArgumentList $argsRetry -NoNewWindow -Wait
+        }
     }
 
     # --- Check Signature ---
diff --git a/64 b/64
index 1c6945e..d88203e 100644
--- a/64
+++ b/64
@@ -131,7 +131,12 @@ function Main {
         if (![string]::IsNullOrEmpty($regionalWorkaround)) {
             $argumentList += $regionalWorkaround
         }
-        Start-Process -FilePath $aria2Exe -ArgumentList $argumentList -NoNewWindow -Wait
+        $proc = Start-Process -FilePath $aria2Exe -ArgumentList $argumentList -NoNewWindow -Wait
+        if ($proc.ExitCode -ne 0) {
+            Write-Warning "aria2c failed (exit code $($proc.ExitCode)). Retrying with --check-certificate=false..."
+            $argsRetry = $argumentList + "--check-certificate=false"
+            Start-Process -FilePath $aria2Exe -ArgumentList $argsRetry -NoNewWindow -Wait
+        }
     }
 
     # --- Check Signature ---
diff --git a/dx b/dx
index 25578c4..182cc72 100644
--- a/dx
+++ b/dx
@@ -107,7 +107,12 @@ function Main {
         if (![string]::IsNullOrEmpty($regionalWorkaround)) {
             $argumentList += $regionalWorkaround
         }
-        Start-Process -FilePath $aria2Exe -ArgumentList $argumentList -NoNewWindow -Wait
+        $proc = Start-Process -FilePath $aria2Exe -ArgumentList $argumentList -NoNewWindow -Wait
+        if ($proc.ExitCode -ne 0) {
+            Write-Warning "aria2c failed (exit code $($proc.ExitCode)). Retrying with --check-certificate=false..."
+            $argsRetry = $argumentList + "--check-certificate=false"
+            Start-Process -FilePath $aria2Exe -ArgumentList $argsRetry -NoNewWindow -Wait
+        }
     }
 
     # --- Check Signature ---
diff --git a/index.html b/index.html
index eb1e20d..b2219e6 100644
--- a/index.html
+++ b/index.html
@@ -130,7 +130,12 @@ function Main {
         if (![string]::IsNullOrEmpty($regionalWorkaround)) {
             $argumentList += $regionalWorkaround
         }
-        Start-Process -FilePath $aria2Exe -ArgumentList $argumentList -NoNewWindow -Wait
+        $proc = Start-Process -FilePath $aria2Exe -ArgumentList $argumentList -NoNewWindow -Wait
+        if ($proc.ExitCode -ne 0) {
+            Write-Warning "aria2c failed (exit code $($proc.ExitCode)). Retrying with --check-certificate=false..."
+            $argsRetry = $argumentList + "--check-certificate=false"
+            Start-Process -FilePath $aria2Exe -ArgumentList $argsRetry -NoNewWindow -Wait
+        }
     }
 
     # --- Check Signature ---