BaseCamp was working fine today, first time I had used it since the upgrade to Windows 10. Then I tried to upgrade it. Big mistake. The existing installation announced it had to be uninstalled, so I did, but then BaseCamp_452.exe crashed with MSI Error: InstallFailure. I tried a manual install (i.e. unzipping and trying to install from the folder) and even went back to BaseCamp_425.exe. Turned off firewall and virus checker. Same Error. The most useful-looking troubleshooting page on garmin.com directs to a Microsoft fix that doesn't work in Windows 10.
I am in the US, have vanilla Windows 10.
Help please.