We are giving you a step by step guide to easily Install Magento 1 extension via FTP-

Step 1: Install Magento 1 extension via FTP

Collect the latest version of the Magento extension from the release notes

Step 2: Install Magento 1 extension via FTP

Remove the earlier extension 

Step 3: Install Magento 1 extension via FTP

Properly Disable the cache-

• Click system and then cache management
• Hit the select all option
• Go to the action list and click Disable
• Hit the submit

Step 4: Disable the debugging

• Go to the System then Tools and then Compilation
• Hit the Disable button

Step 5: Install the extension 

Step 6: Enable Cache

• Go to the system then Tools and then Compilation
• Hit the run complication process

Step 6: Refresh the Cache

• Go to the System and then the Cache Management
• Hit the Flush Magento Cache
• Then hit the Flush Cache Storage
• Hit Flush javascript/CSS cache

Step 7: Log out

Step 8: Log in to the Magento 

Note: 

• Adobe will not support Magento 1 from June 30, 2020
• If the installation is successful, you will be able to see the extension configuration menu within the Magento administrative interface 
• Do not forget to clear your browser’s cache to Install Magento 1 extension via FTP