Due to the fact it was coded with Autoit, virus scanners sometimes give false positives. Autoit has been used for the creation of viruses before, and has led to some AV's detecting all apps created with Autoit as viruses. This is a known and on going issue in the Autoit community https://www.autoitsc...oIt_and_Malware
The only real remedy is for me to send the updater.exe and source code to the company and have them whitelist the program. however as soon as i update the program again i have to resend the sample.
Though your Avira definitions may need updating, as here are the current scan results from virustotal.com (56 different AV engines)
3 less common AV's currently flag it as a false positive using heuristic analysis, Avira isn't one of them.
As for the 'connection reset' error, its probably decided to start blocking the file download or website.
Your welcome to use the older TekagisUpdater (its never generated any false positives from any AV engines), but I should warn you it will probably stop working shortly once i start changing things.