I have tested on three different PC's and two different browsers IE9 and the latest Firefox.
The 1.13.0 Pro EX.exe is not downloading correctly, the download will sometimes pause at random percents and even after resumed it will not complete, it will do as if it has completed but the file is not the full 21.9MB in size, it will sometimes be 10MB other times it will be 19MB but never completely finishes hence the installer is corrupt and won't work.
I believe this is an issue with the Mirillis File Server, please have a look at this ASAP guys.
I don't like having to go to external mirrors to download the file because I don't know if the source can be trusted, so far I have had to do this and been able to get the full working file but not from the Mirillis website.
I am sure I am not the only person experiencing this.