Refactor SheepIt client download logic to always fetch the latest version, ensuring cached jars do not become stale. Improved error handling for download failures.

unified_sheepit_launcher.ps1

@@ -57,28 +57,23 @@ try {
     `$urls = $urlLiteral
     `$headers = @{ 'User-Agent' = 'Mozilla/5.0' }
 
-    if (Test-Path `$jarPath) {
-        Write-Host "SheepIt client already present at `$jarPath. Skipping download." -ForegroundColor Green
+    # Always fetch client-latest; cached jars go stale when the farm bumps minimum client version.
+    `$downloaded = `$false
+    foreach (`$url in `$urls) {
+        Write-Host "Downloading SheepIt client from `$url..." -ForegroundColor Cyan
+        try {
+            Invoke-WebRequest -Uri `$url -OutFile `$jarPath -UseBasicParsing -Headers `$headers
+            `$downloaded = `$true
+            Write-Host "Download complete -> `$jarPath" -ForegroundColor Green
+            break
+        }
+        catch {
+            Write-Host ("Download failed from {0}: {1}" -f `$url, `$_.Exception.Message) -ForegroundColor Yellow
+        }
     }
-    else {
-        `$downloaded = `$false
 
-        foreach (`$url in `$urls) {
-            Write-Host "Downloading SheepIt client from `$url..." -ForegroundColor Cyan
-            try {
-                Invoke-WebRequest -Uri `$url -OutFile `$jarPath -UseBasicParsing -Headers `$headers
-                `$downloaded = `$true
-                Write-Host "Download complete." -ForegroundColor Green
-                break
-            }
-            catch {
-                Write-Host ("Download failed from {0}: {1}" -f `$url, `$_.Exception.Message) -ForegroundColor Yellow
-            }
-        }
-
-        if (-not `$downloaded) {
-            throw 'Unable to download SheepIt client from any known URL.'
-        }
+    if (-not `$downloaded) {
+        throw 'Unable to download SheepIt client from any known URL.'
     }
 
     Write-Host "Starting SheepIt client..." -ForegroundColor Cyan