After Installing "Export SMS and contacts" app on your iPhone, follow below instructions

Step-1 : Connect your iPhone to computer using a USB Lightning cable. Once connected, open iTunes application in your computer. Backup your iPhone to computer manually using iTunes. If you don't have iTunes Installed on your computer, Please download and Install iTunes from the Apple website. iTunes Download Page

It may take some time to complete the backup. After successful completion of Backup proceed to "Step 2"

Step-2 : Download and Install Desktop Companion app from below

macOS Download for Mac

Version:

1.0

Compatibility :

Mac OS 10.6 or Higher

Windows OS Download for Windows

Version:

1.0

Compatibility :

Windows 7 or higher


Step-3 : After Installing SMSBackup desktop app, Open the same in your computer.

Step-4 : After opening SMSBackup app, you should be able to see list of backups with your Device name (If you don't see your device in the list of backups, please ensure that you should complete Step 1 properly. Please use Live chat or contact us section for any issues

Step-5 : Choose the device to browse messages. Messages can be filtered by contacts. Click "Save" button to save messages as PDF or Excel format to your computer.

Note for Mac Users : This Step is applicable for only MacOS 10.14+ Mojave, others older Mac OS users can skip this step.
Go to -> System Preferences -> Privacy & Security -> Privacy ->Click on Lock Icon at bottom and Unlock -> Scroll Down left list and Select 'Full Disk Access' and Click '+' button the right side, select "Applications" and select "SMSBackup" App from the popup dialog. Close System Preferences & SMSBackup App and reopen "SMSBackup" desktop app from your computer.