Is it possible to install MAMP on an external drive? MAMP GmbH December 22, 2015 12:22 Updated Follow No, MAMP has to be installed on the system drive. Related articles My Apache Server will not start? Where can I find the log files? I upgraded to MAMP PRO 5 and I am missing databases. What is the standard procedure for updating MAMP PRO? Does MAMP PRO 5 run on Mac OS Catalina beta?