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You have to create symlinks manually, checklist:  
1. Open the terminal  
2. Move downloaded typo3_src-6.2.4.zip to host's root  
    mv ~/Downloads/typo3_src-6.2.4.zip /Application/MAMP/htdocs/typo3/ 
    
3. Go to destination folder:  
    cd /Application/MAMP/htdocs/typo3/ 
    
4. Still in this location unzip downloaded package (you can remove zip file after that)         unzip typo3_src-6.2.4.zip 

5. Still in this location create a symlink to that extracted directory with name typo3_src :     ln -s typo3_src-6.2.4 typo3_src 

6. Still in this location create a symlink to index.php pointing file in created symlink:      ln -s typo3_src/index.php index.php 

7. Still in this location create a symlink to typo3 folder pointing folder in created symlink:  
    ln -s typo3_src/typo3 typo3 
    
8. Still in this location copy file _.htaccess from source folder to host's root:  
    cp typo3_src/_.htaccess ./ 
    
9. Still in this location copy file composer.json from source folder to host's root:  
    cp typo3_src/composer.json ./ 
    
10. Still in this location create file FIRST_INSTALL  
    touch FIRST_INSTALL 
    
11. That's it! Open the host in the browser and start the configuration  

After all the steps your file structure should look like (command ls -la):  

FIRST_INSTALL _.htaccess 
composer.json 
index.php -> 
typo3_src/index.php 
typo3 -> typo3_src/typo3 
typo3_src -> typo3_src-6.2.4 
typo3_src-6.2.4 
NOTE: try to avoid using name typo3 as a folder name for host's root, it's better to use name according to project i.e.: /Application/MAMP/htdocs/my-project-1/