It's an old problem that has resurfaced. Even though I registered the site for the plugins it is telling me that I must have a valid subscription. I clicked on the 'Check for Updates' but this time that does not correct the problem. I am therefore unable to update the programs
This issue is known in this moment for the Views Plugin at current versions, which shows a notice to register even it is registered
This however should not happen for other plugins.
That issue should as well not prevent you from updating thru the Installer tab.
I see that you use Views 2.6, Types 3.0, Toolset Forms 2.0.1 along with Access 2.4.4 and Maps 1.4.2
This means you where able to update at least Toolset Forms as that is latest version.
Or, did you replace that manually already?
That is what I can suggest as a manual fast solution to the issue if you cannot solve it for now:
https://toolset.com/faq/how-to-install-and-register-toolset/#manual-installation-if-you-dont-have-types-plugin
Trying to replicate the issue with the same starting Plugin versions as you have, and I can see the message " You must have a valid subscription in order to get upgrades or support for this plugin. Purchase a subscription or enter an existing site key." even if I register in the plugin list, and the Installer Tab provides the update fine, I can see it, but when I try to download it, I see "Update package not available. ()"
This seems replicable even with just Types 3.0 and Views 2.6 by now.
This may be due to new versions not being server correctly.
I am investigating with my colleagues if they see the same, but they will be back Monday only and the Developers will also be able to just investigate then.
Meanwhile I suggest the manual update elaborated above.
This is now resolved.
Please can you update the plugins from the download area of Toolset so you can solve the issue on your install as well?