> Source: [sk171674](https://support.checkpoint.com/results/sk/sk171674)

# sk171674 - When you upgrade an Endpoint Security Client with an E1 Anti-Malware engine to an E2 Anti-Malware engine, not  all the KAV drivers are removed

| Property | Value |
|----------|-------|
| Solution ID | sk171674 |
| Date Created | 2021-01-22 |
| Last Modified | 2021-01-27 |
| Technical Level | General |
| Products | Endpoint Security |
| Versions | Cloud, E89.X, E88.X |
| OS | Windows |

## Symptoms

- When you upgrade an Endpoint Security Client E83.00/E83.10/E83.11 with an E1 Anti-Malware engine to an E2 Anti-Malware engine, not all the KAV drivers are removed.

## Cause

An uninstaller change was made to remove the KAV Anti-Malware engine in later clients (E83.15 and higher). The E2 Anti-Malware engine clients can only be upgraded in this fashion.

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## Solution

A hotfix has been created to resolve this issue. In addition, an eppatcher has been created to clean up KAV components from E83.00, E83.10 and E83.11 E1 Anti-Malware engine clients to E2 Anti-Malware engine clients.  

[Contact Check Point Support](https://www.checkpoint.com/support-services/contact-support/) to get a Hotfix for this issue.   
A Support Engineer will make sure the Hotfix is compatible with your environment before providing the Hotfix.   
For faster resolution and verification please collect [CPinfo](https://supportcenter.checkpoint.com/supportcenter/portal?eventSubmit_doGoviewsolutiondetails=&solutionid=sk92739) files from the Security Management and Security Gateways involved in the case.

**Hotfix installation instructions:**   
Refer to [sk168597 - How to install a Hotfix](https://supportcenter.checkpoint.com/supportcenter/portal?eventSubmit_doGoviewsolutiondetails=&solutionid=sk168597).

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