added help files for YaCy UI web pages

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+---
+page: htroot/IndexPackDownloader_p.html
+help: help/IndexPackDownloader_p.md
+title: Index Pack Downloader
+package: import-export-federation
+access: admin
+kind: admin-page
+backend_java: source/net/yacy/htroot/IndexPackDownloader_p.java
+---
+
+# Index Pack Downloader
+
+## Purpose
+
+Index Pack Downloader retrieves packaged YaCy index data.
+
+Use it when a prepared index package should be installed instead of crawling from scratch.
+
+## What You Can Do Here
+
+- Index Pack Downloader retrieves packaged YaCy index data.
+- Define the source, target, format, collection, and expected size before starting.
+- Monitor progress because large transfers continue beyond the initial request.
+
+## Page Architecture
+
+Import and export pages translate external data formats into YaCy documents or move YaCy index data into another store. Most long-running actions create background work that should be monitored afterward.
+
+## Correct Use
+
+Prepare source and target details before starting: file path or URL, format, collection, credentials if needed, and expected size. Imports and exports can continue in the background, so confirm progress on the related monitor or queue page.
+
+## Access And Safety
+
+Administrator access is required. YaCy protects `_p` pages as administration pages.
+
+Protected related endpoint(s): `/IndexPackDownloader_p.html`.
+
+## Automation And API
+
+Page backend: `source/net/yacy/htroot/IndexPackDownloader_p.java`.
+
+| Endpoint | Method | Access | Backend |
+| --- | --- | --- | --- |
+| `/IndexPackDownloader_p.html` | `GET or POST` | admin | `source/net/yacy/htroot/IndexPackDownloader_p.java` |
+
+### Parameter Guide
+
+The table explains values that an agent or script must set deliberately. Parameters not relevant to a task should be omitted or left at the page default.
+
+| Parameter | Meaning and valid values | Care |
+| --- | --- | --- |
+
+Example request shape:
+
+```http
+GET or POST /IndexPackDownloader_p.html?dlfile=...&dlrepoid=...&dlsource=...
+```
+
+## What To Expect
+
+Small operations may finish during the request; large imports, exports, harvests, and package operations usually need monitoring. Expect progress, logs, queue entries, or generated files rather than instant final search quality.
+
+## Related Pages
+
+- Related transfer work is usually reached through the import/export page for the same format, the index-pack pages, or the queue/status page that reports progress.