I have got a detection from Avira Antivirus during instalaltion of Opera Portable. I uninstalled it.
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Alert for malware (Opera)
August 28, 2018 - 2:45am
#1
Alert for malware (Opera)
August 28, 2018 - 5:36am
#2
Same alert from Avira here.
Same alert from Avira here. Not updated at moment.
August 28, 2018 - 8:45am
#3
Clean, As Always
It's clean as always, as you can confirm with this VirusTotal scan: https://www.virustotal.com/#/file/75ed7233744b7554dff212f8111144a506fc40...
Avast has relatively frequent issues with false positives. You'll have to wait for them to fix their error.