diff --git a/installer/update-ocsentinel.ps1 b/installer/update-ocsentinel.ps1
index 30573c3..66c7ec8 100644
--- a/installer/update-ocsentinel.ps1
+++ b/installer/update-ocsentinel.ps1
@@ -7,6 +7,39 @@ param(
 
 $ErrorActionPreference = "Stop"
 
+function Initialize-OCSentinelTls {
+    $protocols = [Net.SecurityProtocolType]::Tls12
+    if ([Enum]::GetNames([Net.SecurityProtocolType]) -contains "Tls13") {
+        $protocols = $protocols -bor [Net.SecurityProtocolType]::Tls13
+    }
+
+    [Net.ServicePointManager]::SecurityProtocol = $protocols
+    [Net.ServicePointManager]::Expect100Continue = $false
+}
+
+function Get-OCSentinelManifest {
+    param([Parameter(Mandatory)][string]$Uri)
+
+    $parameters = @{ Method = "Get"; Uri = $Uri; TimeoutSec = 60 }
+    if ((Get-Command Invoke-RestMethod).Parameters.ContainsKey("UseBasicParsing")) {
+        $parameters.UseBasicParsing = $true
+    }
+
+    for ($attempt = 1; $attempt -le 3; $attempt++) {
+        try {
+            return Invoke-RestMethod @parameters
+        }
+        catch {
+            if ($attempt -eq 3) {
+                throw "Could not retrieve the OCSentinel release manifest after 3 attempts. Verify that the device can reach gitea.officecom.cloud with TLS 1.2 or newer. Last error: $($_.Exception.Message)"
+            }
+            Start-Sleep -Seconds (3 * $attempt)
+        }
+    }
+}
+
+Initialize-OCSentinelTls
+
 $installRoot = Join-Path ${env:ProgramFiles} "OCSentinel"
 $appExe = Join-Path $installRoot "app\OCSentinelCli.exe"
 $installScript = Join-Path $installRoot "scripts\install-ocsentinel.ps1"
@@ -66,7 +99,7 @@ if ([string]::IsNullOrWhiteSpace($ManifestUrl)) {
 $resolvedManifestUrl = Resolve-ManifestUrl -ManifestUrl $ManifestUrl -Channel $Channel
 Write-Host "Checking update manifest: $resolvedManifestUrl"
 
-$manifest = Invoke-RestMethod -Method Get -Uri $resolvedManifestUrl -TimeoutSec 60
+$manifest = Get-OCSentinelManifest -Uri $resolvedManifestUrl
 if (-not $manifest.version -or -not $manifest.artifactUrl -or -not $manifest.sha256) {
     throw "Update manifest is missing required fields: version, artifactUrl, sha256."
 }
diff --git a/scripts/bootstrap-ocsentinel-ninja.ps1 b/scripts/bootstrap-ocsentinel-ninja.ps1
index 9e71c99..834c465 100644
--- a/scripts/bootstrap-ocsentinel-ninja.ps1
+++ b/scripts/bootstrap-ocsentinel-ninja.ps1
@@ -8,7 +8,39 @@ param(
 
 $ErrorActionPreference = "Stop"
 $ProgressPreference = "SilentlyContinue"
-[Net.ServicePointManager]::SecurityProtocol = [Net.SecurityProtocolType]::Tls12
+
+function Initialize-OCSentinelTls {
+    $protocols = [Net.SecurityProtocolType]::Tls12
+    if ([Enum]::GetNames([Net.SecurityProtocolType]) -contains "Tls13") {
+        $protocols = $protocols -bor [Net.SecurityProtocolType]::Tls13
+    }
+
+    [Net.ServicePointManager]::SecurityProtocol = $protocols
+    [Net.ServicePointManager]::Expect100Continue = $false
+}
+
+function Get-OCSentinelManifest {
+    param([Parameter(Mandatory)][string]$Uri)
+
+    $parameters = @{ Method = "Get"; Uri = $Uri; TimeoutSec = 60 }
+    if ((Get-Command Invoke-RestMethod).Parameters.ContainsKey("UseBasicParsing")) {
+        $parameters.UseBasicParsing = $true
+    }
+
+    for ($attempt = 1; $attempt -le 3; $attempt++) {
+        try {
+            return Invoke-RestMethod @parameters
+        }
+        catch {
+            if ($attempt -eq 3) {
+                throw "Could not retrieve the OCSentinel release manifest after 3 attempts. Verify that the device can reach gitea.officecom.cloud with TLS 1.2 or newer. Last error: $($_.Exception.Message)"
+            }
+            Start-Sleep -Seconds (3 * $attempt)
+        }
+    }
+}
+
+Initialize-OCSentinelTls
 
 $installRoot = Join-Path $env:ProgramFiles "OCSentinel"
 $updaterPath = Join-Path $installRoot "scripts\update-ocsentinel.ps1"
@@ -54,7 +86,7 @@ if (Test-Path -LiteralPath $updaterPath) {
 }
 else {
     Write-Host "Reading OCSentinel release manifest: $ManifestUrl"
-    $manifest = Invoke-RestMethod -Method Get -Uri $ManifestUrl -TimeoutSec 60
+    $manifest = Get-OCSentinelManifest -Uri $ManifestUrl
     if ([string]::IsNullOrWhiteSpace($manifest.version) -or [string]::IsNullOrWhiteSpace($manifest.artifactUrl) -or [string]::IsNullOrWhiteSpace($manifest.sha256)) {
         throw "Release manifest is missing version, artifactUrl, or sha256."
     }
diff --git a/scripts/install-ocsentinel-ninja-once.ps1 b/scripts/install-ocsentinel-ninja-once.ps1
index f9dcd74..befdbec 100644
--- a/scripts/install-ocsentinel-ninja-once.ps1
+++ b/scripts/install-ocsentinel-ninja-once.ps1
@@ -7,7 +7,39 @@ param(
 
 $ErrorActionPreference = "Stop"
 $ProgressPreference = "SilentlyContinue"
-[Net.ServicePointManager]::SecurityProtocol = [Net.SecurityProtocolType]::Tls12
+
+function Initialize-OCSentinelTls {
+    $protocols = [Net.SecurityProtocolType]::Tls12
+    if ([Enum]::GetNames([Net.SecurityProtocolType]) -contains "Tls13") {
+        $protocols = $protocols -bor [Net.SecurityProtocolType]::Tls13
+    }
+
+    [Net.ServicePointManager]::SecurityProtocol = $protocols
+    [Net.ServicePointManager]::Expect100Continue = $false
+}
+
+function Get-OCSentinelManifest {
+    param([Parameter(Mandatory)][string]$Uri)
+
+    $parameters = @{ Method = "Get"; Uri = $Uri; TimeoutSec = 60 }
+    if ((Get-Command Invoke-RestMethod).Parameters.ContainsKey("UseBasicParsing")) {
+        $parameters.UseBasicParsing = $true
+    }
+
+    for ($attempt = 1; $attempt -le 3; $attempt++) {
+        try {
+            return Invoke-RestMethod @parameters
+        }
+        catch {
+            if ($attempt -eq 3) {
+                throw "Could not retrieve the OCSentinel release manifest after 3 attempts. Verify that the device can reach gitea.officecom.cloud with TLS 1.2 or newer. Last error: $($_.Exception.Message)"
+            }
+            Start-Sleep -Seconds (3 * $attempt)
+        }
+    }
+}
+
+Initialize-OCSentinelTls
 
 function Get-NinjaValue {
     param([Parameter(Mandatory)][string]$Name)
@@ -26,7 +58,7 @@ if ([string]::IsNullOrWhiteSpace($WebhookUrl) -or [string]::IsNullOrWhiteSpace($
     throw "WebhookUrl and SecretValue must be set as NinjaOne script variables."
 }
 
-$manifest = Invoke-RestMethod -Method Get -Uri $ManifestUrl -TimeoutSec 60
+$manifest = Get-OCSentinelManifest -Uri $ManifestUrl
 if ([string]::IsNullOrWhiteSpace($manifest.artifactUrl) -or [string]::IsNullOrWhiteSpace($manifest.sha256)) {
     throw "The release manifest is incomplete."
 }
diff --git a/src/OCSentinelCli/OCSentinelCli.csproj b/src/OCSentinelCli/OCSentinelCli.csproj
index 5cbf053..441d0b9 100644
--- a/src/OCSentinelCli/OCSentinelCli.csproj
+++ b/src/OCSentinelCli/OCSentinelCli.csproj
@@ -9,10 +9,10 @@
     <RootNamespace>OCSentinelCli</RootNamespace>
     <Product>OfficeCom Sentinel</Product>
     <Company>OfficeCom</Company>
-    <Version>1.3.4</Version>
-    <AssemblyVersion>1.3.4.0</AssemblyVersion>
-    <FileVersion>1.3.4.0</FileVersion>
-    <InformationalVersion>1.3.4</InformationalVersion>
+    <Version>1.3.5</Version>
+    <AssemblyVersion>1.3.5.0</AssemblyVersion>
+    <FileVersion>1.3.5.0</FileVersion>
+    <InformationalVersion>1.3.5</InformationalVersion>
   </PropertyGroup>
 
   <ItemGroup>