The MAMP Pro 1.0/2.0/2.0 upgrade/3.0 serial numbers are stored in the following files:
"/Library/Application Support/appsolute/MAMP PRO/Registration 1.0"
or
"/Library/Application Support/appsolute/MAMP PRO/Registration 2.0"
or
"/Library/Application Support/appsolute/MAMP PRO/Registration upgrade 1.0 to 2.0"
or
"/Library/Application Support/appsolute/MAMP PRO/Registration 3.0"
Example:
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
<dict>
<key>sn</key>
<string>AABB1122CCDD33AA1</string>
</dict>
</plist>
Your serial number is then string
: AABB-1122-CCDD-33AA1
In MAMP Pro 4 and 5 the serial number is longer and is prefixed with an "MP" (which won't occur in the sn-string).
Files:
"/Library/Application Support/appsolute/MAMP PRO/Registration 4.0"
or
"/Library/Application Support/appsolute/MAMP PRO/Registration upgrade 4.x to 5.x"
or
"/Library/Application Support/appsolute/MAMP PRO/Registration 5.x"
Example:
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
<dict>
<key>sn</key>
<string>11112A2AB333C4444DD55EE66F7F7ABCDEA</string>
</dict>
</plist>
The serial number would be: MP-1111-2A2A-B333-C4444-DD55-EE66-F7F7-ABCDE-A
(don't try it – it's probably no valid number because I modified my own serial number massively)