HTTrack

"HTTrack is a free (GPL, libre/free software) and easy-to-use offline browser utility.

It allows you to download a World Wide Web site from the Internet to a local directory, building recursively all directories, getting HTML, images, and other files from the server to your computer. HTTrack arranges the original site's relative link-structure. Simply open a page of the "mirrored" website in your browser, and you can browse the site from link to link, as if you were viewing it online. HTTrack can also update an existing mirrored site, and resume interrupted downloads. HTTrack is fully configurable, and has an integrated help system."

Updated to v3.50 Beta 7
Portable Version available

Home Page
https://www.httrack.com/

Changelog
https://download.httrack.com/httrack-beta-CHANGELOG.txt

"The first packaged builds in nine years: Windows, where the last was 3.49-2 (May 2017), Android, and macOS for the first time ever.

• HTTPS with OpenSSL 3: TLS 1.2 and 1.3, and through an HTTP proxy.
• Large files, long paths, any alphabet: past 2 GB, past the 260-character path limit, accented and non-Latin names.
• Updates that protect your mirror: a server error leaves your copy alone, resumes honour byte ranges, and a truncated body is never cached as complete.
• Modern pages: srcset and lazy-loaded images, <source> and <track> media, SVG sprite fragments, RFC 9309 robots.txt.
• New crawl modes: --sitemap seeds from the site's own sitemap, --single-file writes pages that stand alone, --changes reports what an update did.

Also: SOCKS5 proxies, brotli and zstd, --why to see which filter rule decided a URL, and WARC/1.1 output with a CDXJ index and WACZ packaging."

https://www.httrack.com/page/2/en/index.html

According to this post on PortableFreeware.com, the Beta is more usable than the version from 9 years ago.
https://www.portablefreeware.com/forums/viewtopic.php?p=111186#p111186