If you are not using Roadiz docker images, this issue is certainly due to the fact that your Apache is not well configured to call Roadiz entry points (index.php, dev.php, install.php, clear_cache.php). So main routing is not working and your Roadiz works in Install mode only on the start page, i.e. path
/. Since you get to other page, your Apache does not understand URL like
/install.php/install/check… so it reverts back to
index.php (prod entry point) and then cry because you did not finish installation.
Did you get a look at our Apache conf sample?