Discontinued and rewritten in Python: https://github.com/ecspresso/Notifications/tree/master/MangaDex
Check for new chapters on https://mangadex.org/ with PowerShell.
Install it from PowerShellGallery https://www.powershellgallery.com/packages/MangaDexNotifications/:
Install-Module -Name MangaDexNotifications
Add a manga with Add-MangaDexManga -MangaId #, the ID of each manga can be found in the URL.
Example, monitor Attack On Titan: the url is https://mangadex.org/title/429/shingeki-no-kyojin and the ID is 429: Add-MangaDexManga -MangaId 429. Then run Get-MangaDexUpdates to check for new chapters.
Output: Shingeki no Kyojin has been updated! New chapter: 123
This module also has PushBullet support. Set-MangaDexPushBulletAPI -APIKey 'Key goes here' to add your API key and then Get-MangaDexUpdates -PushBullet send all updates to PushBullet. Get-MangaDexUpdates -PushBullet -Quiet to send updates to PushBullet and supress the output in PowerShell.
The API key is stored as a secure string in a text file.
All settings can be found here ($home variable):
Windows: Homedrive:\Users\Username\MangaDex (ex. C:\Users\JohnSmith\MangaDex)
Linux:
Mac: /Users/username/MangaDex/