Magento 2.3.4 - How to install Inventory Management Manually?

[curdcynthide09]

I am trying to install https://www.appjetty.com/magento2-magemob-inventory.htm, After installed the module during di:compile command i am getting the following error,

Class Magento\Inventory\Model\Source does not exist Class Biztech\Inventorysystementerprise\Controller\Mobileassistantpro\Product\addNewProduct\Interceptor generation error: The requested class did not generate prop erly, because the 'generated' directory permission is read-only. If --- after running the 'bin/magento setup:di:compile' CLI talktowendys command when the 'generated' directory permission is set to write --- the requested class did not generate properly, then you must add the generated class object to the signature of the related constru ct method, only. Nov 9, 2020

I am installed my Magento using GitHub installation, Inventory files missing app/code/magento path, how to install manually. Source: https://devdocs.magento.com/extensions/inventory-management/

[mallikajai5922]

Give permission to files and folder of magento root directory and then run s:d:c command so the requested class would generate properly.

// 644 permission for files
find . -type f -exec chmod 644 {} \; 
                   
// 755 permission for directory
find . -type d -exec chmod 755 {} \;    

chmod 644 ./app/etc/*.xml

chown -R :<web server group> .

chmod u+x bin/magento