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Solution:
CMS site appSettings.config file had following configured:
<add key="CommerceManagerBinPath" value="C:\Projects\SomeProject\Web.CommerceManager\bin" />
<add key="CommerceManagerSharedPath" value="C:\Projects\SomeProject\Web.CommerceManager\Shared" />
Correct value for migration to work is:
<add key="CommerceManagerBinPath" value="C:\Projects\SomeProject\Web.CommerceManager\Bin" />
<add key="CommerceManagerSharedPath" value="C:\Projects\SomeProject\Web.CommerceManager\Shared" />
What is the difference one might ask, first one has lowercase bin second one starts with uppercase - 'Bin'
Problem is in 'C:\Program Files (x86)\EPiServer\CMS\7.5.394.2\Install\Modules\EPiServer Commerce 7.5.394.2\Install\Install EPiServer Commerce.ps1' script line 206:
$commerceManagerPath = $commerceManagerBinPath.trimEnd("Bin")
So it Expects it to be Bin, no lowercase value will work unless script file is fixed or, your own site configuration reffers to bin folder as 'Bin'
When migration project from Commerce 1 R3(7.0) to 7.5 have following error in EPiServer Deployment Center window: