Is it possible to install MAMP on an external drive? MAMP GmbH December 22, 2015 12:22 Updated 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? Does MAMP PRO 5 run on Mac OS Catalina beta? MAMP PRO will not install/ start I upgraded to MAMP PRO 5 and I am missing databases.