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@nubesurrealista, IANAL but what we call updates are basically derivatives from copyright's perspective. Now, a derivative of a work obtained under the GPLv3 must also be released under the a forward compatible license (GPLv3 or AGPLv3), which requires that distributor to provide the preferred form for modification (i.e. source code for most software) if requested by a user. If the entity distributing the software to you is not the sole copyright holder of the work originally released under the GPLv3, then it must comply with such request of yours. Otherwise, it has every right to relicense the work under something else that does not require disclosure of the source code.