v0.3.5: If "Update and Restart" did nothing for you, download the dmg from the release page and install it over the old one once; updates will work normally after that, and 18 more fixes

If "Update and Restart" did nothing for you, download the dmg from the release page and install it over the old one once; updates will work normally after that. This version updates shader translation: the first export of each game after updating re-translates its shaders and takes longer than usual. "Export and sign it yourself": on Mac / Windows you can export an unsigned S2Arm.ipa and game images and install them on iPhone / iPad with your own signing. S2Arm now shows only the latest item when it opens (new version, what's new in this version, important notices); older ones are not shown again and stay in Messages. iPhone Duo split screen: the game on the top half, virtual controls on the bottom half, with its own editable layout. When adding a game with only an update or DLC and no base game, S2Arm now tells you right away what is missing. Fixed switching libraries and exporting on Mac failing when the game library is on an exFAT drive. More reliable in-app updates on Mac: two update checks running at once no longer break each other, failed updates now leave a log, and leftover update files are cleaned up after a manual install. Fixed some games having sound but no picture, and some stopping right at launch. Fixed wrong motion-control (gyroscope) axes on iPhone Duo. A false checksum mismatch in DLC data no longer blocks exporting. Windows: installing to the same phone a second time no longer fails; the installer now closes S2Arm / Impactor if they are holding the install folder. If the game files were modified and don't match the game package when installing, the error now says what's wrong. The shader cache is no longer mistakenly marked as "stopped writing" after a normal session end. Lower power use for audio: no more idle wake-ups every 5 ms, and faster audio processing on Apple silicon. Fixed wrong free-space readings on the phone (Settings showed tens of GB free, but S2Arm said only a few GB); free space is now measured the way the phone actually has it available. Fixed exports of some large games using tens of GB of memory and taking forever; computers with less memory can now export them too (tested with Ori 2 and The Witcher 3). Faster extraction of fully compressed files during export. Lower GPU load in some games, by about 3–4%.

Upstream release summary · Site editorialv0.3.513 Nov 2026

This is a fix release with 19 fixes; details below.

What changed

If "Update and Restart" did nothing for you, download the dmg from the release page and install it over the old one once; updates will work normally after that.
This version updates shader translation: the first export of each game after updating re-translates its shaders and takes longer than usual. Games already installed on your phone don't need to be exported again.
"Export and sign it yourself": on Mac / Windows you can export an unsigned S2Arm.ipa and game images and install them on iPhone / iPad with your own signing.
S2Arm now shows only the latest item when it opens (new version, what's new in this version, important notices); older ones are not shown again and stay in Messages.
iPhone Duo split screen: the game on the top half, virtual controls on the bottom half, with its own editable layout. (#301)
When adding a game with only an update or DLC and no base game, S2Arm now tells you right away what is missing. (#797)
Fixed switching libraries and exporting on Mac failing when the game library is on an exFAT drive. (#812 #816)
More reliable in-app updates on Mac: two update checks running at once no longer break each other, failed updates now leave a log, and leftover update files are cleaned up after a manual install. (#828)
Fixed some games having sound but no picture, and some stopping right at launch. (#751 #786)
Fixed wrong motion-control (gyroscope) axes on iPhone Duo. (#804)
A false checksum mismatch in DLC data no longer blocks exporting. (#787)
Windows: installing to the same phone a second time no longer fails; the installer now closes S2Arm / Impactor if they are holding the install folder. (#800)
If the game files were modified and don't match the game package when installing, the error now says what's wrong.
The shader cache is no longer mistakenly marked as "stopped writing" after a normal session end. (#618)
Lower power use for audio: no more idle wake-ups every 5 ms, and faster audio processing on Apple silicon. (#630 #761 #767)
Fixed wrong free-space readings on the phone (Settings showed tens of GB free, but S2Arm said only a few GB); free space is now measured the way the phone actually has it available. (#801 #802)
Fixed exports of some large games using tens of GB of memory and taking forever; computers with less memory can now export them too (tested with Ori 2 and The Witcher 3).
Faster extraction of fully compressed files during export. (#744)
Lower GPU load in some games, by about 3–4%.

Before updating

Back up saves and review migration notes for your installed version. Release notes describe upstream changes, not independent compatibility testing by this site.

Read the full upstream release