Quote Originally Posted by lat9 View Post
When you get that "blank page", there should (keyword) be some files in the site's /logs sub-directory named myDebug*.log. They'll have information that identifies what the underlying issue is and what source file is the culprit.

Did you performed that 'clean' install of zc158, did you use a copy of your live site's database (running that through zc_install to upgrade) or did you let the zc_install process simply create you a starting database?
After extracting zc v158, open the index.php got blank screen swguy referenced using the install path as its a known issue with php 8