Manual Installation (Installing Magento 2 extension by copying code)
For Windows OS:
Go to <your Magento install dir>/app/code. Under that, create the folders using the following hierarchy:
For Linux OS:
Enter the following commands keeping their order:
cd <your Magento install dir>/app/code mkdir -p Biztech/ Magemobcart
After this, find the Download Zip and extract all files and folders in Biztech/ Magemobcart
After the successful installation, you have to run the command on the Magento2 root directory- “php bin/magento setup: upgrade” and “php bin/magento setup:di:compile”
If you see blank page or permission error, go to Terminal (Linux)/ Command Prompt (Windows) and run the following command:
cd [magento root directory] [var]
run the following command
$ chmod –R 777 *
After running the command, log into the admin panel and clear the Cache.
Go to SYSTEM -> Tools (section) -> CACHE MANAGEMENT to clear the cache. 
After successful installation, you can see the ‘MageMob Mobile App Builder’ under the ‘APPJETTY’ tab inside STORES -> Configuration. 
You can also see MageMob Mobile App Builder in the drawer menu.