Ok, I figured something out. Installation of sage 9 fails because of my composer version. I had 2.3.5. Deleted that and installed composer 2.0.14 and it worked.
Install composer:
Sage9 installation works with an older Version of composer. I used 2.0.14. the latest one results in an error.
You should setup the complete project (including Bedrock) with this version of composer.
Eventually delete your old composer version:
Thus write in terminal:
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php -r "copy(‘https://getcomposer.org/installer’, ‘composer-setup.php’);“
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IMPORTANT: Check this website for an up to date hash: Composer
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php -r "if (hash_file(‘sha384’, ‘composer-setup.php’) === ‘USE UP TO DATE HASH’) { echo ‘Installer verified’; } else { echo ‘Installer corrupt’; unlink(‘composer-setup.php’); } echo PHP_EOL;“
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php composer-setup.php —version=2.0.14
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php -r "unlink(‘composer-setup.php’);“
Then Follow this: How to install Composer globally on Mac OS
Caveat: there is no .zshrc file in the user directory in Catalina. It is in /etc/