Is PrimeFaces 4.x compatible with theme Ecuador or any premium theme ? or i have to migrate my project to a specific version , please advise me before buying any theme thanks
PF 4 is very old and you should DEFINITELY consider updating just for security reasons alone. It looks like most Premium Themes are compatible with PF 5 or PF 6+ from this blog post on PrimeFaces site.
https://www.primefaces.org/premium-layouts-and-themes-updated/
This update cycle brings compatibility with PrimeFaces 6.0, due to a resource optimization in PF6, the menus of layouts were broken. We’ve added the fix in a way that same layout can both work with 6.0 and also 5.x. with version detection.
But once again I cannot recommend enough upgrading to PF 6.2 if possible to get the benefits of all the latest browser fixes and security fixes.