https://nsis.sourceforge.io/Download has a link “Release Notes” which leads to https://nsis.sourceforge.io/rn/v3.05 then redirects to https://sourceforge.net/projects/nsis/files/NSIS%203/3.05/RELEASE.html/view . That document is HTML but redered as text, e.g. the readers sees:
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns='http://www.w3.org/1999/xhtml'>
<head>
<title>3.05</title>
...
Please include the fix for bug #1241 in the next NSIS release, every credible developer needs to sign the uninstaller.
This is outside our control, Sourceforge used to allow viewing html files like this but not anymore. Some time after this bug report, /view now just redirects to a page where you can download the html file.