Hi team,

I just moved my gallery into a subfolder root/subfolder. I reinstalled the zen successfully in the /subfolder. However, when I view my gallery, and try and click on one of my galleries, I get 404.

Please advise,
Thanks!

You probably did not run setup.

Yes, I ran zp-core/setup.php after moving the files. Please advise.

Check your .htacces file. The RewriteBase should be:
RewriteBase /subfolder

Setup should put out a note about that and offer the option to update/create a proper htaccess file.