Go to share SharePoint site that your files contain>> right-click on the file you want to make a downloadable link >> right-click on it >>> share >>anyone link click the link. ( How ever please do not use this link we only share it with anyone link to get permission to the file.)
Using your Chrome browser right click on the file you want to make the downloadable link >> click on download >> go to the download section in Chrome browser >>> right-click on the URL >> and save it to Notepad.
- You can use this URL and when you click on it it will automatically download
Please note that the user must be logged into their Microsoft account with the necessary permissions for this link to work. If a sign-in page shows up lease login with a Microsoft credential then file will download automatically
It’s not a limitation this Issue happens because of this feature has not been implemented for SharePoint pages yet. Currently, the only workaround is to use the methord I mentioned above.
Ref: Create downloadable link to file | SharePoint – Microsoft Q&A