We can’t do this, because we have never had any copies of your backups (unless you paid for and set up access to UpdraftVault storage – in which case you should fill in our customer support form, with your order number).
Your backups are stored in whatever location you chose in the UpdraftPlus settings (e.g. Dropbox, Google Drive, etc.).
If you chose none of them, then your backups are kept on your web server (in the directory wp-content/updraft – we don’t recommend doing this, as then if hackers destroy your website or your web hosting company goes bust, then you lose both the site and the backups in one go – which is why UpdraftPlus shows you a warning if you select that option). In that case, you can get them via FTP, or from your web hosting company’s control panel, or by requesting from your web hosting company (we don’t have access to your web hosting company, so it’s them you’d need to talk to).