In reference to the small buttons, you know you can change their size from :TOOLSICON:?

The issue that occurs here is that because of memory constraints, CC3+ cannot compute the entire high-resolution map in memory at the same time for the export, which is why it exports in multiple passes, each pass rendering a part of the map.

Unfortunately, effects from entities outside of the current rendering part won't be considered, such as shadows from entities far away. There is a certain overlap to handle the closer but right outside things, but considering effects from everything in the map is impossible due to the aforementioned resource problem.

However, you can change the default size of these render chunks, causing CC3+ to render much more of the map in one go. This is done by typing in EXPORTSETMPPP on the CC3+ command line and hitting enter. The command line will then ask for the number of pixles, type in the value 40000000 (The current value, shown in brackets is probably 4000000, keep your zeroes straight). and hit enter. Depending on your export resolution, you will export the map in much fewer passes, perhaps even just a single pass.

Note that if this isn't enough, the other solution is to either consider using shorter shadows, avoiding the problem, or manually creating them using a partially transparent polygon.

Well, yes, I downloaded it from the official Wizards website some 20 years ago, that version have always worked fine. Unfortunately, I don't have the rights to redistribute it, so I can't provide you with my copy.

You should be fine with just Patch 3 though. Patch 3 was designed to completely replace the others. I know some discrepancies have been reported up through the years (of which some of these are noting more than old files left behind that were replaced by others, just not deleted when you install the update), but in general, patch 3 is designed to be the complete package, and can be installed without patch 1 & 2 installed.

I installed it fine on latest version of Win 10 a couple of weeks ago on my new computer (Program and all patches). The only issue I had was that my streamdeck software somehow prevented setup from continuing, it just hang without opening the GUI. Once I terminated the streamdeck software, the install proceeded just fine.

To check if any software is blocking an installer, you can open up task manager, go to the details tab and see if you find setup.exe there (or whatever the name of the installer). Then you can right click on it in the list and select Analyze Wait chain. If there is anything there at all, that's what blocking it.

You'll need to contact support by email, and they'll help you out.