We can't start installation :(
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Your server is running PHP 8.1.2-1ubuntu2.20, but PrestaShop requires PHP 7.4 or lower.
To install PrestaShop 1.7.8.11 you need to downgrade your server's PHP version.
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PrestaShop installation needs to write critical files in the folder var/cache.
Please review the permissions on your server.
You can contact your web host provider to fix the above requirements.