Update on a workaround:
1. Uninstalled the latest version and install version 1.2 (https://amazon-affiliate.eu/en/about-the-programme/amazon-associates-link-builder/).
2. Do the update from within your wordpress install plugins page, it should alert you there is an update available.
3. It did throw an error (The plugin AmazonAssociatesLinkBuilder/amazon-associates-link-builder.php has been deactivated due to an error: Plugin file does not exist.) and so was deactivated, as it says.
4. Click out of there by going to Dashboard, then go back to Plugins.
5. Reactivate it, now the updated version works.
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This reply was modified 9 years, 4 months ago by a565.
I am experiencing the same thing. Installed the plugin today and the Settings page show a single line – Access Key ID, but nothing can be entered in it. I tried using other browsers also – Firefox and Edge. I am using the latest wordpress WP 4.7.1 and believe that might have something to do it.