Thanks for the reply, Luis.
I've done that process a few times already and I've actually come across that exact thread while researching this topic
When I'm testing the process, I'm only picking one mod to test with, which has been updated recently on the workshop. So far after testing multiple mods, the same signal 11 error prevails. No mods- clean startup no problem.
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Tonight while continuing to debug this, I came across two mods (Easy Cooker 1.0 and Admin Signs) which work fine with the TCA Workshop downloader, even when installed together. So, the TCA workshop download appears to be functioning fine and multiple mods can successfully be loaded onto a server by using it. I was beginning to think that it was corrupting files upon install which may have been causing the error but that was merely speculation. I just don't understand why some of the more popular mods that have been updated recently such as Structures+ don't work.. they're not even substantially large in size.
My seven hours of research on the subject haven't turned up any other cause thus far so I'm going to stop here pending any new information that surfaces.
Let me know if anyone else has any more luck!