WinRAR used to have a feature that was Registered-only (integrity-protecting and signing archives with the licensed name (Authenticity information), similar to ZIP's Security Envelope feature). However, it was dropped. Technically, there is only the nag at startup in the unregistered version.
Side note: 7-zip is a totally free, open-source, cross-platform (and better) replacement for the proprietary WinRAR and WinZIP software. It also compresses better if you select the "Ultra" compression mode, as it uses the current state-of-the-art LZMA2 compression library (also used on Linux via the "xz" command). It also supports extracting ZIP and RAR archives, among other formats -- but cannot create RAR archives I believe: it can create ZIP or 7z archives instead... RAR is a proprietary format anyway and should not be used IMHO. 7z archives are open, cross-platform and can be made or extracted on Windows using the 7-zip file manager, or on Linux: install the 7z program, for example on Debian/Ubuntu: "apt install p7zip-full p7zip-rar" (Installing p7zip-rar package adds the proprietary RAR extraction functionality to the 7z package) Download 7-zip for Windows from 7-zip.org Check out the compression benchmark at the bottom of the website: "Usually, 7-Zip compresses to 7z format 30-70% better than to zip format. And 7-Zip compresses to zip format 2-10% better than most of other zip compatible programs." (including WinRAR)
I use 7zip extracting msu updates and ISO's and many other software's, find very useful and easy to extract with 7zip. Win RAr is also nice. So basically 7zip is good in extracting.
I can't because I've never sent or offered it to you. I asked if you wanted to have a lifetime unlimited company license for free - you said you didn't want to. You can always download the 40-day trial version from the winRAR website.