I've extracted the key phrase from your text, which is 'download the new The Bat! Professional 10.5.2.1'. I understand you're looking to download this software.

After conducting a search, I found that The Bat! Professional 10.5.2.1 is an email client that offers advanced features such as strong encryption, backup and restore options, and an integrated address book.

You can download the latest version of The Bat! Professional from various sources, including:

1. Official website: You can visit the official website of The Bat! and download the software directly from there.

2. Softonic: Softonic is a popular software download site that offers The Bat! Professional 10.5.2.1 for download.

3. FileHorse: FileHorse is another reliable source to download The Bat! Professional 10.5.2.1.

Before downloading, please ensure you're getting the software from a trusted source to avoid any potential risks or malware.

Additionally, I've found some other related information that might be helpful:

* The Bat! Professional has received positive reviews for its user-friendly interface and advanced features.

* It's available in multiple languages, including English, German, French, and more.

* The software offers a free trial version, allowing you to test its features before purchasing.

If you have any specific questions or need further assistance, feel free to ask!

Download the new The Bat! Professional 10.5.2.1