Flagged by Norton

[BrecMadok]

Filename: Setup_MakeMKV_v1.15.4.exe
Threat name: WS.Reputation.1
Full Path: C:\Users\BrecMadok\Downloads\Setup_MakeMKV_v1.15.4.exe
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On computers as of 1/16/2021 at 3:45:31 PM
Last Used 1/16/2021 at 3:47:31 PM
Startup Item - No
Launched - No

Threat type: Insight Network Threat. There are many indications that this file is untrustworthy and therefore not safe
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Setup_MakeMKV_v1.15.4.exe Threat name: WS.Reputation.1
Locate

Many Users - Thousands of users in the Norton Community have used this file.
Mature - This file was released 1 year 1 month ago.
Medium - This file risk is medium.
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https://www.makemkv.com/download/Setup_ ... 1.15.4.exe
Downloaded File from makemkv.com
Source: External Media

Setup_MakeMKV_v1.15.4.exe
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File Actions
File: C:\Users\BrecMadok\Downloads\ Setup_MakeMKV_v1.15.4.exe Removed
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File Thumbprint - SHA:
80f9b56f8bca14e847ac86fb2b3db574a79dbe4ba557832fe238a3f370c60c8e
File Thumbprint - MD5:
c1d8dec1802d933a7e8ee679378c6d2a

[Woodstock]

It is most likely a false positive. I have that setup file on my system, too (I have all versions since 1.5.6 Beta for Windows), and AVG has not flagged any of them in 11+ years.

You can upload the file to Norton to have them study it in depth (their website used to say how, not sure if that's changed).