Fixed download bug

- Fixed: Multiple files could not be downloaded due to a caching issue

frontend/src/app/download/download.component.ts

@@ -172,12 +172,20 @@ export class DownloadComponent {
 
       const blob = new Blob([response.data], {type: 'application/octet-stream'});
       const url = window.URL.createObjectURL(blob);
-      const a = document.createElement('a');
+
+      // Check if download blob already exists and remove it if it does
+      let a = document.getElementById('fileDownloadBlob') as HTMLAnchorElement | null;
+      if (a !== null) {
+        a.remove();
+      }
+
+      a = document.createElement('a');
       a.style.display = 'none';
       a.href = url;
       a.download = filename;
       a.id = 'fileDownloadBlob';
       document.body.appendChild(a);
+
       this.saveDownloadedFile();
 
       // Clean up by revoking the Blob URL and removing the temporary anchor (currently disabled due to saveDownloadBtn)