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Isles of Sea and Sky

A fantastic, oceanic, open world puzzle adventure. · By Cicada Games

Problems getting IOSAS via Portmaster

A topic by aloebach created Mar 03, 2025 Views: 160 Replies: 3
Viewing posts 1 to 3
(1 edit)

*EDIT: The patch is looking for v1.02a, which i erroneously listed as 1.2a below*


Hello! I don't have a windows machine and wanted to play IOSAS, and was thrilled when I saw that it's available via Portmaster. Unfortunately when i tried to install and run this version (v1.2b) it doesn't work. I believe the issue is that Portmaster is set up for v1.2a. Would it be possible to get this fixed, or to make the old v1.2a available so i can run it via Portmaster? 


Errors outputted during Portmaster's automated patching process:

"GAMEDIR is set to: /userdata/roms/ports/iosas

Removed unecessary files

Applying xdelta patch

Failed to apply patch

xdelta3: target window checksum mismatch: XD3_INVALID_INPUT

xdelta3: normally this indicates that the source file is incorrect

xdelta3: please verify the source file with sha1sum or equivalent"


Thanks in advance!

Hi aloebach, sorry for the delay. A member of our discord, .jeod made this Portmaster version, so please try reaching out to them and hopefully they can fix it. :)

Hey there, this thread was recently brought to my attention. I would love to support the itch.io release! Can you shoot me a DM on your Discord when you have a chance? Thank you!

Hey @aloebach the itch.io version is now supported with portmaster and will be live by the end of the week :) Thanks Cicada Games!