HI Jelmer,
Thank you for your purchase.

You need to download premium version form email that you get when you make this purchase(some hostings treat it like a Spam so please check your Spam folder as well). Also, you receive email with credentials for our store https://store.tms-plugins.com/login where you can download premium version.

My suggestion is to update the plugin manually by following these steps:

1.) Download zip from our store or from email that you receive when you make purchase

2.) Use FTP to open /yourwordpressfolder/wp-content/plugins

3.) Delete existing ameliabooking folder.

4.) Upload previously downloaded ameliabooking folder through FTP to plugins folder (unzip it)

5.)  Go to WP-admin panel, open Plugins section.

6.) Deactivate Amelia Plugin, and then activate it again.

7.) Clear server and browser cache

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If you are using hosting where you are not allowed to your FTP  then follow those instructions:

1.) Download zip from our store or from email that you receive when you make purchase

2.) Delete Amelia plugin from WordPress Plugins page

3) Click on Add new on Plugins page

4) Click on Upload plugin on Plugins page

5.) Choose previously downloaded ameliabooking zip file

6.) When uploading is done, please Activate Amelia plugin

7.) Clear server and browser cache.

Please note that deleting plugin from Plugins page you WILL NOT lose your data, because it is already saved in database.

Please note that our plugin have size around 6 MB so if yo are not able to upload plugin through WordPress plugins page, then you need to increase 

upload_max_file size, 

post_max_size ,

max_execution_time

You should be able to find these values in your php.ini file or on your hosting panel. If you can't find it yourself please ask your hosting provider to provide it.

Best regards.