Yosemite download issues related to cooling fan

I have spent over 10 hours on the phone with tech support, and 4 days attempting to resolve a download problem on my MBP.  After upgrading to Yosemite I attempted to update my primary software package for work and the download continues to stall during download.  Apple care told it was the Software's company's fault, the software company pointed me back to Apple.  Apple pointed me back to them and they pointed back to Apple - I just want what I have paid for to work as advertised.
Here is where I am at now:  I will begin the download and it will progress like normal, then the cooling fan comes on and the download with stop.  Several times the progress of the download, in percentage, actually shows to decrease - meaning it goes backwards somehow.  I cancel the download and restart the software the cooling fan stops, I restart the download and after a random amount of time the coolings fans start again and the download stalls.  I know that this sounds very unrelated but since I noticed this connection it has done it every time since and I have went through this process at least 12 times since first making the connection.
I have followed all of the steps from Apple's senior advisor in checking settings and troubleshooting.  She told me that it was the software's problem.  The software company tells me their servers are good and then shows me the mountain of reports from Yosemite users that are having similar issues.  Meanwhile I'm stuck with a $2500 dollar MBP and a $3000 software investment that I can't use for the purpose that I bought them.  When I told Apple care about the fan issue they inferred that I was crazy to think that the cooling fan could be connected - maybe I am.

It's not clear to me if this is an issue within the software package such as with a download feature within a particular software package or software distribution mechanism, or if this is something weird with OS X Yosemite that's causing a problem elsewhere that's effecting this download.
Who is the third-party vendor, and what is the package?  Is there a posting from the vendor pointing to the issue?
Has the third-party vendor plans to offer an alternative download path, which would seem reasonable for a case such as this with a "mountain of reports" involved?
Given your long discussion with the vendor and with Apple, have there been specific suggestions you've tried and found haven't worked?  Otherwise, we're just going to repeat some of those.
The cooling fan gets involved when something goes compute-bound or otherwise starts looping, either due to a design problem or due to a bug.  Adobe Flash Player tends to spool up the fans, for instance.

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