I see this warning whenever I run a scan with ClamWin Portable:
WARNING: Local version: 0.98.4.1 Recommended version: 0.98.4
New: MBox Viewer (Mar 22, 2026), Platform 30.3 (Mar 29, 2026)
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This is a known problem with Clamwin. This message shows up because the ClamWin is at version 0.98.4.1, but ClamAV, which ClamWin uses as its scanning engine, is only at 0.98.4
You won't be stopped from scanning, it's just an annoyance.