This is pretty late, but if the link changes when the file name changes, I'm pretty sure Hexowatch can help you. It can monitor practically every changes on a website, including HTML changes and visual changes, which I think is the two options you can use. I'll drop a link to their website here.
Are you still looking for one?
If you are, Hexowatch (see hexowatch.com) is a good one to try out. You can monitor the web page for visual, HTML, and content changes.
The notification is sent via email (or Telegram or Slack, if you're paying), but I don't think you can customize notifications. Iirc, the notification is a screenshot of the change along with the link to the web page.
Name: Hexowatch
Location: Wilmington, United States
Pitch: Hexowatch is your AI sidekick to monitor any website for visual, content, source code, technology, availability or price changes. Access archived snapshots, get change alerts and extract data from any website in minutes.
Manually checking multiple websites every day is time consuming, repetitive and tedious.
Hexowatch works 24/7 to help spot trends, spy on your competitors, visually check your website, keep an archive of every change and turn any website into your own private data source accessing changes as a downloadable csv file, google sheets or via Zapier.
Looking for: Users and feedback.
Name: Hexowatch
Location: Wilmington, United States
Pitch: Hexowatch is your AI sidekick to monitor any website for visual, content, source code, technology, availability or price changes. Access archived snapshots, get change alerts and extract data from any website in minutes.
Manually checking multiple websites every day is time consuming, repetitive and tedious.
Hexowatch works 24/7 to help spot trends, spy on your competitors, visually check your website, keep an archive of every change and turn any website into your own private data source accessing changes as a downloadable csv file, google sheets or via Zapier.
Looking for: Users and feedback.