{{- $productPathData := findRE "[^/]+.*?" .Page.RelPermalink -}}
{{- $currentVersion := index $productPathData 1 -}}
{{- $influxdbVersions := .Site.Data.products.influxdb.versions -}}
<ul>
  {{- range $influxdbVersions -}}
  {{- if in . "v2" -}}
  {{- if lt (float (replaceRE "v" "" .)) (float (replaceRE "v" "" $currentVersion)) -}}
  <li><a href="/influxdb/{{ . }}/install/">Install InfluxDB {{ replaceRE "v" "" . }}</a></li>
  {{- end -}}
  {{- end -}}
  {{- end -}}
</ul>