For upgrades to 2.2.13 prior to 2.2.6 it is advised to contact support at the Modx forum but I can't find any specific posts for this.
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There shouldn't be any problems. An easy way to upgrade is to use the install.php script - but this only works if your server is configured to allow url_fopen, i.e. streaming a URL as a file.
https://github.com/evolution-cms/installer
Just put the install.php file in your site's root and run it from the browser, domain.com/install.php
It will download (this is where the url_fopen bit comes into play) and extract the MODX zip file, remove itself, and open the MODX setup in your browser. The most painless updgrades I've ever done!