The wizard gains a Media page between Host check and Topology: every external asset the deploy needs (the three eval ISOs, the extracted ConfigMgr media, the ADK and WinPE offline layouts, the VC++ redistributable pair, the version-pinned ODBC MSI) is checked against LabSourcesRoot, one row each. Direct-link assets download straight into the correct folder, Authenticode-verified before a file is kept or a bootstrapper is executed; sign-in-gated ISOs open the vendor download page in the default browser; every row can open its expected folder in Explorer. The Review page lists any missing required media and keeps Deploy disabled until a re-check passes. The check ships as the exported Test-LabMedia cmdlet, with resolution rules mirroring Install-HomeLab exactly. Also includes 1.4.1: the Phase 08 prerequisite-folder fix for #1. See CHANGELOG.md.