altstoreio / altstoreio/AltStore

"(1007) This app is in an invalid format" error

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Dominant language
Swift
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Description

Hi there,

I recently had a problem with AltStore. When installing the app Pica Comic, AltStore ended up with the error "This app is in an invalid format.", but there was no problem when using other sideloading software for the same file. The package download link is attached here .

Contributor guide

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First steps

  1. Read the whole issue, then the project's contributing guide.
  2. Comment on the issue to say you are picking it up — it saves two people doing the same work.
  3. Fork the repository and make your change on a branch.
  4. Open a pull request that references the issue number.

Research direction

Start by reproducing the installation of Pica Comic v2.1.1 from the linked release and trace where AltStore reports the invalid-format error. The issue provides no file or test entry point, so first identify the package-validation path; done means the package installs successfully or the incompatibility is clearly characterized.

Written by the indexing model from the issue text.

Assessment

Tech stack
ios, swift
Domain
mobile-dev
Issue type
Bug
Difficulty
4/5
Estimated time
3-5 days
Activity status
Quiet
Clarity
Needs clarification
Newbie friendliness
38/100

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