You can revert back to MAMP PRO 3.52 by downloading it here
Install MAMP PRO 3.52 over your current installation of MAMP PRO 4.xx. Do not use the uninstaller in /Applications/MAMP PRO, this will delete your database data.
One Last Step ...
First back up your entire /Library/Application Support/appsolute/MAMP PRO/db directory.
1. Did you make any modifications to your database while using the MAMP PRO 4 demo ?
NO - Rename (or remove) your /Library/Application Support/appsolute/MAMP PRO/db/mysql56 folder
YES - Rename your /Library/Application Support/appsolute/MAMP PRO/db/mysql folder
Rename your /Library/Application Support/appsolute/MAMP PRO/db/mysql56 folder to
/Library/Application Support/appsolute/MAMP PRO/db/mysql
Note: Older versions of MySQL, such as MySQL 5.5 (MAMP PRO 3), may not support newer file formats of MySQL 5.6 (MAMP PRO 4). If you have done significant work in MAMP PRO 4.x, you may not be able to downgrade back to MAMP PRO 3.x.