Try reading this
Prepar3d link.
Although it may not sound like your problem, there's a good chance that it's related.
Their solution -
download to a different location worked for me on my second download.
Because of the horrendous troubles I had with the first V2.x I thought that I had a bad download. So I deleted
EVERYTHING and downloaded again. AND AGAIN.
It turned out that it wasn't the download. It was Prepar3d V2.x itself.
I played around
A LOT with the settings and so must have downloaded/installed the original V2 five or more times without any problems insofar as downloading.
I don't recall if you have a choice of multiple download sites. If you do, cancel the download & switch to another site. If not, cancel the download and wait a minute to try again.
Most of my downloads were done in less than 1.5 hours, but I seem to recall that one attempt said that it'd take 11 to 12hours
NOTEThere was one "problem" that I had was during many of the installs. Every so often I would have a pop-up saying that there was a problem installing a file. I
think that it was caused by my computer.
Anyway, after waiting 3 to 5 seconds, I would click on the
Retry button and it continued to load the "problem" file. When it would pop-up again, just waited a few seconds and clicked
Retry. It was never the same file.
Once Prepar3d was installed everything worked as it was supposed to. That's why I say that it must have been caused by my computer.