For offline software I wouldn’t consider it a problem, but for something that connects to the internet I would want it to have the latest versions of its dependencies.

It looks like the dev has been updating their funding details recently, hopefully they have an update planned.

https://github.com/TachibanaGeneralLaboratories/download-navi/commits/master/

I’ve always wondered what’s the use of a download manager, especially on a smartphone. What’s your use case?