takes a second to come up, and during that time it's possible to accidentally
start the new installation. Wait for the uninstaller to finish, and check whether
it succeeded.
Now using NSIS 2. The script assumes all previous versions are released
with 1.x, and all versions from here on in are 2.x. This is extremely important,
since we have to work around an incompatible uninstaller change.
Glenn Maynard
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