Web installer fails with "Failed to download manifest" — 404 on cors-proxy URL

[agenturamg]

The web installer at https://tasmota.github.io/install/ fails for every variant with "Failed to download manifest".
Browser DevTools Network shows 404 on:
https://cors-proxy.espressif.tools/?url=https://github.com/tasmota/install/releases/download/2026-05-05.d.ba17364d2893369a789899d0084d16ad7d8a3a7a/release.tasmota.manifest.json

Note the URL points to a .d. (development) release tag but requests release.tasmota.manifest.json. Switching variants in the dropdown changes the tag (e.g. 2026-04-21.d.ad402c3...) but the same .d. + release.* mismatch and 404 occurs.
The static manifest at https://tasmota.github.io/install/manifest_ext/release.tasmota.manifest.json returns valid JSON, so the issue appears to be that install-button.js constructs an incorrect release-tag URL.
Tested in Chrome (latest) Incognito with no extensions. OS: Windows.

[datanizing]

Same for me on MacOS

[Jason2866]

Install works for me, but not the selected version a older one than the selected gets installed. This bug annoys me since a while and my tries to fix seems are not correct or not complete.

[Jason2866]

fixed