This thread is resolved. Here is a description of the problem and solution.
Problem:
After installing the OTGS Installer, the client is unable to install WPML as it seems to load indefinitely, accompanied by an Error 500, suggesting a server issue.
Solution:
We recommend checking the installation status again as initial server issues may have been resolved. If the problem persists, we advise reinstalling the OTGS Installer and ensuring that the server meets all requirements for running WPML. Additionally, it's crucial to verify that there are no conflicts with other plugins. For detailed guidance on installation and troubleshooting, please visit our documentation: WPML Documentation.
If this solution does not resolve the issue or seems irrelevant due to being outdated or not applicable to your case, we highly recommend checking related known issues at https://wpml.org/known-issues/, verifying the version of the permanent fix, and confirming that you have installed the latest versions of themes and plugins. Should the problem continue, please do not hesitate to open a new support ticket with us for further assistance at WPML Support Forum.
This is the technical support forum for WPML - the multilingual WordPress plugin.
Everyone can read, but only WPML clients can post here. WPML team is replying on the forum 6 days per week, 22 hours per day.
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Last updated by 1 week, 6 days ago.
Assisted by: Bruno Kos.

