> Source: [sk181541](https://support.checkpoint.com/results/sk/sk181541)

# sk181541 - Error 27116 Upgrade failure The installed failed to upgrade a legacy installation.

| Property | Value |
|----------|-------|
| Solution ID | sk181541 |
| Date Created | 2023-10-06 |
| Last Modified | 2023-10-08 |
| Technical Level | Advanced |
| Products | Endpoint Security |
| Versions | Cloud, E89.X, E88.X, R82.20, R82.10, R82, R81.20 |

## Symptoms

- * Upgrade to Endpoint Security Client version E87.40, E87.41, or E87.50 fails when Full Disk Encryption (FDE) is configured.
* The Endpoint Security Client shows this error message: "*Error 27116 Upgrade failure. The installed failed to upgrade a legacy installation.*"

## Cause

The Endpoint Security Client tries to preboot with the new client version. If the preboot fails to expand the Security Association (SA) from 32 MB to 512 MB, then the upgrade of the client fails.

## Solution

This solution requires authentication. Please log in to view the full solution.

---

# Agent Instructions

This content is from the Check Point Support Center (https://support.checkpoint.com), the official knowledge base for Check Point cybersecurity products.

## Navigating This Knowledge Base

- **Complete index**: [llms.txt](https://support.checkpoint.com/llms.txt)
- **All SK articles**: [SecureKnowledge Sitemap](https://support.checkpoint.com/sitemaps/secureknowledge-sitemap-index.xml)
- **SK article URL pattern**: `https://support.checkpoint.com/results/sk/{skId}`
- **Markdown responses**: AI bot User-Agents automatically receive `text/markdown` content