Hi Mikkelm,

I think you should also copy the sources of the live installation to your local development environment in order to have all uploaded files, which are stored in the filesystem and, what is more important, the custom theme, which is probably missing on your local environment and that's likely the reason for the white screen. Once you get the local installation up and running you can then try to update it.

Regards,
Alfred

In my opinion, it's best to copy over ALL files. If you're not the one who made the site, the previous developer could have modified core concrete5 files (although it's not advised to do so). There's a slight chance this has happened, but there IS a chance.. so better not risk that and copy all of your existing server files over and see what happens. Of course, do change the site.php file to your local settings (database name, username, password etc.) and the .htaccess (RewriteBase /) file if the site is under a sub directory.

Have a look at my BackupVoodoo addon.
https://www.concrete5.org/marketplace/addons/backup-voodoo/...