I have published a new release and removed the link to the excavator miner binaries: https://github.com/aaronsace/MultiPoolMiner/releases
NiceHash permit you to download excavator yourself should you wish to use it with MultiPoolMiner.

Please also note:-
If you have Windows 7, please update PowerShell:
https://www.microsoft.com/en-us/download/details.aspx?id=50395
You may need the C++ redistributables if you don't already have ithem
https://www.microsoft.com/en-gb/download/details.aspx?id=40784
https://www.microsoft.com/en-us/download/details.aspx?id=48145

Please submit bugs and feature requests in the 'issues' section: https://github.com/aaronsace/MultiPoolMiner/issues