If you need to update Magento 2 Cron Schedule Extension by Magefan, please follow the steps below.

Note: the updating instructions depend on the method the Cron Schedule extension was installed with.

Update using composer

If the Cron Schedule module was installed via the composer (check if vendor/magefan/module-cron-schedule folder exists), then you need to run these simple CLI commands in Magento 2 directory:

composer remove magefan/module-NAME
composer require magefan/module-NAME ^x.x.x
# replace NAME with:
# cron-schedule - for Basic plan
# cron-schedule-plus - for Plus plan
# cron-schedule-extra - for Extra plan
# replace x.x.x with the version you want to use
php bin/magento setup:upgrade
php bin/magento setup:di:compile
php bin/magento setup:static-content:deploy

If you want to upgrade to Plus or Extra, check this guide on how to upgrade Cron Schedule extension plan.

Update using archive and FTP 

If the Cron Schedule module was installed via FTP (check if app/code/Magefan/CronSchedule folder exists), then follow these commands:

1. Download the latest version of the Cron Schedule extension archive from magefan.com.

2. Extract archive.

3. Make the backup copy of the app/code/Magefan/CronSchedule or app/code/Magefan/CronSchedulePlus or app/code/Magefan/CronScheduleExtra folder on your server and then remove it. 

4. Using FTP, copy the app folder from the archive to your Magento 2 Directory. 

Install Magento 2 Extension Using FTP

4. Run update CLI commands in Magento 2 directory:

php bin/magento setup:upgrade
php bin/magento setup:di:compile
php bin/magento setup:static-content:deploy

Note: if you don't want your website to be down during deployment, try these zero downtime deployment commands for Magento 2.