Specific filename extension internal error

Added by Nest K 2 months ago

It can be awkward because English is not my first language.

Redmine version is 4.1.1.stable.19852
An error occurs when downloading a specific extension.
For example when downloading the d14 extension it shows an internal error. There are more file name extension.
I didn't find anything unusual in the settings, so how to fix it?
can you help me?
Thank you