Issue Summary
You are correct, that this is a LetsEncrypt issue:
The solution is what you see here:
that the cacert.pem file of the server has to be updated, and be configured within the php.ini file of the server, to make your server’s certificate valid again.
There are no other ways of activating the Pro version, as curl connection is necessary for this, so it has to be fixed within the server of the website.
Troubleshooting Questions
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Does this happen for all sites in Local, or just one in particular? Yes. All sites that need to activate Smart Slider.
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Are you able to create a new, plain WordPress site in Local and access it in a Browser? Yes.
Replication
Describe the steps that others can take to replicate this issue. If you have screenshots that can help clarify what is happening, please include them!
System Details
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Which version of Local is being used? 6.1.2
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What Operating System (OS) and OS version is being used? OS BIG SUR
- For example: macOS Catalina or Windows 10 Professional
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Attach the Local Log. See this Community Forum post for instructions on how to do so:
Security Reminder
Local does a pretty good job of scrubbing private info from the logs and the errors it produces, however there’s always the possibility that something private can come through. Because these are public forums, always review the screenshots you are sharing to make sure there isn’t private info like passwords being displayed.