I can't the software to download on my Windows 10 desk top....
I'd like to preview the software prior to buying a 6530, and with that in mind what is everyone's current assessment of the 6530, most posts are pretty old.

I’ll assume you are asking where to “find” the MSD Pro-Data +Software to download on MSD website. Here’s the link.
https://www.msdperformance.com/support/resources/#Software_Downloads

 

I left out the word "get" and was timed out by the time I noticed.

So.... I can't get the software to download on my Windows 10 desk top.

 

I can't download the software onto my desk top.

 

OK...Got it, Google Chrome wasn't allowing .exe files to be downloaded, I used Internet Explorer...Worked like a charm.

Now....How does everyone like the 6530 box, I'd like to try retarding timing at the hit.

 

^^^^^^ What ignition model # is presently installed in your car ??

 

Mallory 685

 

Try uninstalling Google Chrome and installing it again. For more correct operation, I would recommend using a third-party Uninstaller so that it clears all residual files and the installation is clean. Almost always, after the usual removal, there are some files that can then interfere with the correct operation of the program. When I reinstall something, then completely clean the PC from residual files and did not encounter such problems, everything worked well.