Sometimes the simplest things take the longest time.
Normally, Plan-G, is simple install, with a setup required after the install. None of the problems that you are finding.
It IS worth getting it working though, so keep with it. If worst comes to worst, you may have to seek support on their website.
UninstallingWindow, intentionally, does a bad job of uninstalling software, thinking that you might uninstall something by mistake.
So Microsoft lets you "uninstall" the program, BUT NOT the data. And a bunch of other stuff, like the Windows Registry settings.
To do a complete uninstall, you'll have to re-install the program again.
Next, download
Revo Uninstaller FREEWARE.
Revo Uninstaller will hunt down and remove ALL parts of a program that was installed. Don't worry, it won't delete other files that Plan-G
reads, such as your flight plans.
I've used Revo for about 15 years, or more, without any problems. As with the Windows uninstaller program, make sure that you uninstall what you intend to uninstall.
SimConnectOver the years Microsoft has produced three known versions of SimConnect. For the most part, they are interchangeable. But not always.
As a Prepar3d user, if I want to use some FSX files, I have to install all three SimConnect versions. They can run side by side without any problems, so you might as well install all three too.
For more details read about the Prepar3d SimConnect problem read
(only if necessary)-
Does v3 need any Simconnect installs?The best way for you to get all three versions is from here -
FsPassengers - Download Simconnect.
These are NOT FSPassengers files, these are from Microsoft. Downloading them is not piracy.
READ the ReadMe file. It's VERY short. Essentually, you have to install then in a particular order before you re-install Plan-G
(or possibly any program that needs them).
Install the three SimConnect.msi by double clicking on them in order:
1-RTM/Simconnect.msi
2-SP1/Simconnect.msi
3-XPACK/Simconnect.msi
4-Reinstall FsPassengers Plan-G
Once all that is done try re-installing Plan-G. I've been using it for about 5-6 years
(without problems).
It's entirely possible
(don't tell my wife that I said this) that I have the install & setup sequence wrong.
If absolutely necessary, read the instructions.