Update from ClickOnce doesn't work when ADX version changes

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Update from ClickOnce doesn't work when ADX version changes
Add-In isn't being registered after update when ADX changes from 8 to 10 or back 
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David Redl




Posts: 2
 Joined: 2025-07-28
Hello,

I hope you can help me. Our company is trying to upgrade our add-in from ADX 8 to ADX 10. During our testing cycle, we identified that ClickOnce installations that attempted to use the built-in upgrade feature would fail when the ADX version changed. Specifically, the new version of our add-in would be installed (to a different folder than before) and would appear in Programs and Features, but would not be registered with Excel.

We've confirmed that this same pattern exists in both directions. If we install a version of our add-in that uses ADX 10 and then release a higher-numbered version of our add-in that uses ADX 8 then we will see the same behaviour of the new version of our add-in being installed to a different folder, appearing in Programs and Features, but not being registered in Excel.

Can you please advise what we need to do to get this upgrade path to work as expected?

Thanks,
David
Posted 28 Jul, 2025 14:51:05 Top
David Redl




Posts: 2
 Joined: 2025-07-28
Could I please get some help with this?

Please let me know if there is any additional information I can provide that would be useful here.

Thanks
Posted 13 Aug, 2025 17:47:53 Top
Andrei Smolin


Add-in Express team


Posts: 19169
 Joined: 2006-05-11
Hello David,

An add-in installs to Program Files if a setup project requires this. With Add-in Express generated setup project this may occur if your add-in has the RegisterForAllUsers property (see the add-in module) set to true (mistakenly). Besides, ClickOnce is targeted to per-user installations and installing to Program Files isn't expected.

Regards from Poland (GMT+2),

Andrei Smolin
Add-in Express Team Leader
Posted 14 Aug, 2025 14:51:33 Top