I am trying to re-register Toolset on the site and to install updates. However, when entering the site key I receive the "invalid" error. I have already tried to unregister and re-register, to no avail.
I know the one solution given is to make a manual update of the plugin by downloading it and uploading it again, but this would erase all of the plugin data which is how the site was built.
When I try to manually upload the newer version, I get the error that the plugin folder already exists (see screenshot attached). To correct this, I would need to delete the old version of the plugin — which warns that deleting would erase all of the data.
Thank you for your guidance, our IT support was able to upload the updated files to our dev site. There is still the question of the license key. How are we supposed to use these plugins in a Dev and Test and Live environment, when there is only one key for one domain?
Your user account only allows for a single site to get the license key.
This key will allow you to get the updates automatically. However I would recommend that you add the key to the environment that you will be using to test the stability of your site.
You can still perform a manual update of the plugins on your other environment, its just that the site with the key can update using the backend installer.