Change from BITS to WebClient

[ivassallo19]

🐛 Summary

Within Get-OPAFile you use Start-BitsTransfer, but I run ScubaGear under a different account than my main login, as it has admin privileges, and BITS is prevented unless the session is logged in.
Should change it to use WebClient as you have done within Get-ExeHash

To reproduce

Steps to reproduce the behavior:

1. Initialize-SCuBA

Expected behavior

OPA download succeeds

Any helpful log output or screenshots

Paste the results here:

Manually attempting BITS:

Start-BitsTransfer : The operation being requested was not performed because the user has not logged on to the network

Add any screenshots of the problem here.

[buidav]

Thanks for opening an issue on this.

Looking into this Start-BitsTransfer was used over Webclient for Get-OPAFile because it included a download progress bar for user feedback.
An idea on our end as an enhancement is to use Webclient as a failsafe for when Start-BitsTransfer fails.

[ivassallo19]

Given that, another idea is to use Invoke-WebRequest, as this does include a progress bar, albeit without a total bytes or percent complete