Release build not working

I was looking to try this script for the first time, but the release packages don't appear to be working. All of the packages marked as [] at come up as not found.

I assumed that the package under assets marked [] was the correct package, but I am unable to do a new install with any of these packages by simply uploading the contents and then pointing the browser to the folder.

I tried to do a clean install on 2 separate servers running php 7.4. Both display an internal server error when you point the browser to the folder. The first one showed no errors and the log folder only shows this:

2020-07-24 22:48:45 Info: Start installer.
2020-07-25 02:12:33 Info: Start installer.

I then tried to do the install on another server and this one also fails but does get further and actually records an error log:

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  1. 2020-07-25 01:55:01 Error: Fatal Error (256): [Error] Class 'Locale' not found
  2. #0 /vendor/cakephp/cakephp/src/I18n/I18n.php(316): Cake\I18n\I18n::getDefaultLocale()
  3. #1 /vendor/cakephp/cakephp/src/I18n/I18n.php(74): Cake\I18n\I18n::getLocale()
  4. #2 /vendor/cakephp/cakephp/src/I18n/I18n.php(202): Cake\I18n\I18n::translators()
  5. #3 /vendor/cakephp/cakephp/src/I18n/functions.php(88): Cake\I18n\I18n::getTranslator()
  6. #4 /vendor/cakephp/cakephp/src/Error/ExceptionRenderer.php(303): __d()
  7. #5 /vendor/cakephp/cakephp/src/Error/ExceptionRenderer.php(206): Cake\Error\ExceptionRenderer->_message()
  8. #6 /vendor/cakephp/cakephp/src/Error/ErrorHandler.php(137): Cake\Error\ExceptionRenderer->render()
  9. #7 /vendor/cakephp/cakephp/src/Error/BaseErrorHandler.php(192): Cake\Error\ErrorHandler->_displayException()
  10. #8 /vendor/cakephp/cakephp/src/Error/BaseErrorHandler.php(176): Cake\Error\BaseErrorHandler->handleException()
  11. #9 [internal function]: Cake\Error\BaseErrorHandler->wrapAndHandleException()
  12. #10 {main} in /vendor/cakephp/cakephp/src/Error/ErrorHandler.php, line 180]

Thanks in advance!