Pure Simple themes comes with license keys feature only from version 4.3.2. We will soon release video tutorials on license keys activation. You can follow any of the method to update a themes. Via WordPress Dashboard
Step 1: Download the “puresimple.4.3.3.zip ” file from here https://www.styledthemes.com/my-account/
step 2: Go to dashboard -> Appearance -> Themes
steps 3: Activate any other themes, so you will be able to delete existing old version of pure simple
step 4: Delete old pure simple version
ste5 : Click on add new bottom at the top -> Then click on upload theme button -> Then click on choose file-> move to local folder where your downloaded files from step 1 exists
step 6: Upload that theme and activate.
Step 1: Download the “installable theme” from here https://www.styledthemes.com/my-account/ and unzip it
Step 2: Access your server via FTP or SFTP
Step 3: Browse to wp-content/themes/
Step 4: Delete and override the “puresimple” folder files with the new ones downloaded in step 1.