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The most recent backup download option is 3.6.29.3822 and the changelog hasn't updated since 3.6.29.1090.

C'mon.
Current backup download option is v3.6.312130 and the file size is..... 1MB
REALLY? You can do better than this, GOG!
Looks like an error as the installer asks for the location of the nest part.
Main discussion of this here - https://www.gog.com/forum/divinity_original_sin_2/gog_andor_larian_this_offline_installer_is_an_insult_to_common_sense/page2