Catch RequestFreeAppLicense exception

DepotDownloader/Steam3Session.cs

@@ -223,11 +223,19 @@ namespace DepotDownloader
         }
 
         public async Task<bool> RequestFreeAppLicense(uint appId)
+        {
+            try
             {
                 var resultInfo = await steamApps.RequestFreeLicense(appId);
 
                 return resultInfo.GrantedApps.Contains(appId);
             }
+            catch (Exception ex)
+            {
+                Console.WriteLine($"Failed to request FreeOnDemand license for app {appId}: {ex.Message}");
+                return false;
+            }
+        }
 
         public async Task RequestDepotKey(uint depotId, uint appid = 0)
         {