Hi @harsheena,
I am sorry the tpls folder has been changed after the latest massive updates.
You can follow this now.
1. Copy page-templates directory from /plugins/download-manager/src/package/views directory to your active theme directory.
2. Make a new directory as download-manager on your active theme directory.
3. Now remove all files from {active-theme}/download-mamager/page-templates except the template files you need to update.
4. Update template file(s) in {active-theme}/download-manager/page-templates directory as per your need. As you need to remove download count and file size, you have to remove these tags [download_count] and [file_size]
Let me know please if you still find any issues.
Thanks