As specified here:
http://www.jrsoftware.org/ishelp/topic_winvernotes.htm
I'm using this:
MinVersion=10.0.10240
However, when I try to run my setup on Windows 10, it says this:
This program does not support the version of Windows your computer is running.
Why? Is this a bug around Inno Setup?
I've verified that I've installed the 10240 build, with ver and systeminfo commands on cmd:
Z:\Desktop>ver
Microsoft Windows [Versión 10.0.10240]
Note that I'm testing this in a Virtual Machine.
As @TLama commented, I'd say that you are using an old version of Inno Setup (pre 5.5.6).
With Inno Setup 5.5.6:
2015-08-07 14:44:33.588 Setup version: Inno Setup version 5.5.6 (u)
...
2015-08-07 14:44:33.588 Windows version: 10.0.10240 (NT platform: Yes)
...
2015-08-07 14:44:59.745 Installation process succeeded.
The same installer compiled with Inno Setup 5.5.5:
2015-08-07 14:46:42.354 Setup version: Inno Setup version 5.5.5 (u)
...
2015-08-07 14:46:42.354 Windows version: 6.3.9600 (NT platform: Yes)
...
2015-08-07 14:46:42.354 Message box (OK):
This program does not support the version of Windows your computer is running.
2015-08-07 14:46:44.026 User chose OK.
2015-08-07 14:46:44.026 Got EAbort exception.
2015-08-07 14:46:44.026 Deinitializing Setup.
2015-08-07 14:46:44.026 Log closed.
Both for a trivial installer like:
[Setup]
AppName=My Program
AppVersion=1.5
DefaultDirName={pf}\My Program
MinVersion=10.0.10240
The difference is caused by this change:
https://github.com/jrsoftware/issrc/commit/9402b5c9a463cfe7618341011cc5b65ffc968ccd
As documented in the Inno Setup revision history for 5.5.6:
Added the Windows 10 "compatibility" section to the various manifest resources used by Inno Setup. This enables any check for the operating system version to get the real version number (10.0) instead of getting the same version number as it did in Windows 8.1 (6.3).