While version 23 is no longer a standard download, you may still find it through these methods:
Illustrator CC 2019 (v23) generally requires 64-bit Windows 10 or Windows 7 SP1. Note that modern versions of Creative Cloud apps have transitioned away from x86 (32-bit) support, so you should verify your hardware compatibility before installing. Feature Highlights of Illustrator 2019 (v23) Download Illustrator 2019 v23 x86 zip
Platforms like ProDesignTools traditionally host direct download links to Adobe's own servers for versions up to 2019. While version 23 is no longer a standard