Extract the zip file.open the 3.x folder.Upload the birthdayreminder.ocmod.zip file from Extensions > Installer. Refresh the Modifications from Extensions > Modifications. Then Go to Extensions > Modules.You will see the Birthday Reminder module.Click on Intall. After successful install You can configure the settings as per your requirements.

Extract the zip file.open the 2.3x/2.x folder.Upload admin,catalog folder to your server from the "Upload" folder.
Upload the install.ocmod.xml file from Extension Installer. Refresh the Modifications from Extensions > Modifications. Then Go to Extensions > Modules.You will see the Birthday Reminder module.Click on Intall. After successful install You can configure the settings as per your requirements.

Create date of birth custom field from Custom Fields. Enable the module status and select the custom field. You can create Email template for your customers. Now coupon stting to configure the coupon setting.