The AV issues are mostly time related. Once a few users have reported the exe it should be sorted.

Some key details from the log:

There is not enough information about this file to recommend it.
This file has been seen by no Symantec users.
Symantec has known about this file approximately 2 days.
[download]

I re-added the older berrybrew to the path and it worked again so that part is corrected.

I then ran berrybrew upgrade, and now I get this error. I had to revert the changes to the perls.json file in the git repo for it to work (this is not new). I don't imagine this is due to the installer, and is more likely something else in the development process, or how I have things set up.

berrybrew version

Unhandled Exception: System.ArgumentException: Item has already been a
+dded. Key in dictionary: '5.26.2_64_PDL'  Key being added: '5.26.2_64
+_PDL'
   at System.Collections.Hashtable.Insert(Object key, Object nvalue, B
+oolean add)
   at System.Collections.Specialized.OrderedDictionary.Add(Object key,
+ Object value)
   at BerryBrew.Berrybrew.PerlGenerateObjects(Boolean importIntoObject
+)
   at berrybrew.Bbconsole.Main(String[] args)
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UPDATE:

I ran a git pull on the repo and the issue has now gone away. The issue was perhaps something to do with berrybrew upgrade and git.