Powershell installer downloads everytime MPM starts
I already have PowerShell 6.0.2 installed but everytime i run MPM it starts downloading the installer again. I dont have any old or RC versions and even if the installer exists in the downloads folder (around 50mb), it deletes it and downloads another one.

I'm using the latest master commit.

here is a text copy of my batch file and some logs

[Start.txt](https://github.com/MultiPoolMiner/MultiPoolMiner/files/2135248/Start.txt)
[MultiPoolMiner_2018-06-25.txt](https://github.com/MultiPoolMiner/MultiPoolMiner/files/2135237/MultiPoolMiner_2018-06-25.txt)
[MultiPoolMiner_2018-06-25_15-58-00.txt](https://github.com/MultiPoolMiner/MultiPoolMiner/files/2135238/MultiPoolMiner_2018-06-25_15-58-00.txt)
[MultiPoolMiner_2018-06-25_22-06-33.txt](https://github.com/MultiPoolMiner/MultiPoolMiner/files/2135239/MultiPoolMiner_2018-06-25_22-06-33.txt)


