GH4900: Add Inno Setup 7 support

[peymanr34]

Changes (Edited on 2026-06-24):

• Added Inno Setup 7 support.
• Added support for Inno Setup when installed in user mode. ¹

Notes:

• Inno Setup 7 has both 32-bit and 64-bit editions but the previously supported versions are 32-bit only.
• Inno Setup 7 is currently in beta and it's set to be released in 2026-06-29.
• Fixes: Add support for Inno Setup 7 #4900

Footnotes

1. Since nobody asked for this feature I removed it to make the PR easier to review. ↩

[devlead]

Looks like Inno Setup 7 uses different AppIds per architecture in setup.iss: 64-bit → Inno Setup 7, 32-bit → Inno Setup 7 (32-bit). Per AppId docs, uninstall keys are {AppId}_is1, so the 32-bit installer registers as Inno Setup 7 (32-bit)_is1, not Inno Setup 7_is1. Which means we probably also should probe that key?

[peymanr34]

Looks like Inno Setup 7 uses different AppIds per architecture in setup.iss: 64-bit → Inno Setup 7, 32-bit → Inno Setup 7 (32-bit). Per AppId docs, uninstall keys are {AppId}_is1, so the 32-bit installer registers as Inno Setup 7 (32-bit)_is1, not Inno Setup 7_is1. Which means we probably also should probe that key?

Yes, according to this commit, the AppId for the 32-bit version has been changed in the beta version.

Inno Setup (64-bit)	Inno Setup (32-bit)

Also Inno Setup (32-bit) on 32-bit Windows is the same Inno Setup 7 (32-bit)_is1 key which makes sense.

Sorry for not catching this issue before submitting the PR. I'll make the changes.

[devlead]

LGTM 👍

[devlead]

@peymanr34 your changes have been merged, thanks for your contribution 👍

[peymanr34]

@devlead Thank you very much.