https://support.eset.com/kb2357

Solution

ESET recommends that you only enable pre-release updates in situations when a pre-release update will resolve an issue you are having with your ESET product. Once you have received the update that resolves your issue, we recommend that you revert back to regular updates.

Method 1: Enable pre-release updates using ESET Remote Administrator

1. Open the ESET Configuration Editor by clicking Start → All Programs → ESET → ESET Remote Administrator Console → ESET Configuration Editor.
    
2. Expand Windows desktop v5 → Update Profile Settings → and then click Pre-release updates.
    
3. Click the "Value" check box.

Figure 1-1
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Method 2: Enable pre-release updates on client workstations

1. Open ESET Endpoint Security or ESET Endpoint Antivirus. How do I open my ESET product?

2. Press the F5 key to open the Advanced setup window.

3. Expand Update and then click General. 

4. Select Pre-release update.

Figure 2-1
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5. Click OK to confirm the changes.