It seems like you're looking to download an older version of Daum PotPlayer (version 1.7.21999) or explore other versions of PotPlayer.

Here are some options for you:

Option 1: Download Daum PotPlayer 1.7.21999

Unfortunately, I couldn't find a direct link to download Daum PotPlayer version 1.7.21999. However, I can suggest some alternatives:

* Visit the official PotPlayer website ('www.daum.net/potplayer'(http://www.daum.net/potplayer)) and check if they have an archive of older versions.

* Search for torrent files or other file-sharing platforms that may have a copy of Daum PotPlayer 1.7.21999.

Option 2: Explore other versions of PotPlayer

If you're open to trying out newer or older versions of PotPlayer, here are some options:

* PotPlayer Portable: You can download the portable version from 'MajorGeeks'(https://www.majorgeeks.com/files/details/potplayer_portable.html).

* PotPlayer 6: You can find the English version at 'FileHippo'(https://filehippo.com/download_potplayer/).

* Latest stable release (v.231113): You can download the latest version from 'Daum PotPlayer's official website'(http://www.daum.net/potplayer).

Please note that downloading and installing older versions of software may come with risks, such as compatibility issues or security vulnerabilities.

Before proceeding, I would like to confirm if you have any specific requirements or concerns regarding the download process.