SEOistic 1.5.3 — authoritative licensing

Fixes valid Free licenses incorrectly unlocking Business features. Uses WPistic server-assigned plans, preserves supported legacy aliases and explicit legacy maps, and prevents replacement keys inheriting old paid-plan caches. Existing expiry/revocation and bounded outage handling remain enforced. Before upgrading, check server-assigned customer plans; approved complimentary access belongs in WPistic. Verified: 32 isolated licensing checks, PHP syntax, real WordPress clean install and upgrade from the SHA-verified public 1.5.2 release with SEO metadata/options preserved. Runtime-only ZIP uses the canonical seoistic folder. SHA-256: 97109032dbbdd3655f2d69c47946ac1b290e78a54b6ab1b7b1c06d7790a91a6e. This publication alone does not claim installation on customer sites or registered automatic updates.