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RO Patcher Lite (c) 2009-2022 Ai4rei/AN

RO Patcher Lite

Replacement for Gravity's RO patcher. Works faster and doesn't consume your entire memory for just seeing it crashing, aside from this, it works almost exactly as the official patcher does, so that it shouldn't break, unless Gravity changes something vital to their patcher. It is free of any cost and works on every 32-bit and 64-bit Microsoft* Windows* platform.

RO Patcher Lite 4 (kRO) (stable) Download 32-bit / 64-bit
RO Patcher Lite 4 (Bundle) (stable) Download 32-bit / 64-bit
RO Patcher Lite (kRO RE) (untested) Download 32-bit
RO Patcher Lite Help 2.4.5 (incomplete) View Online


[2022-07-01] Release

This release fixes mirror server fallback from a different mirror server not working correctly.

[2022-06-15] Release

This release fixes reusage of waste in GRF archives was not enabled (ever since its introduction in 4.0.0). Depending on amount of wasted space, some archives may shrink in response to being updated. It also fixes the /testpak command reporting Sakray/Test archives as corrupted.

[2021-11-05] Release

This release adds support for the new, short-lived (2021-11-03 ~ 2021-11-17) kRO Sakray server. This is a different server from the one removed in 4.1.2 and requires a new full client. There is no mirror support for this one and it is released only as part of the bundle package.

[2021-11-04] Release

This release fixes an assertion when applying optimized patches.

[2021-10-30] Release

This release improves performance on x64 and WINE and removes kRO RE support, because the patch server is gone. You can still update kRO RE with the previous version for a limited time by using the "Always use mirrors" option from the window menu.

Older entries

Can be found in the news archives.


As some countries seem blocked from using the official kRO patch server, the patcher offers tamper-resistant patch download from community contributed mirrors as fall-back mechanism from version 2.4.5 onwards. Anyone willing is free to apply for inclusion into the list of approved mirrors. Patches served through mirrors are subject to delayed release due to technical reasons.

kRO Mirror Status


On Windows 98 On Windows XP On Windows 7 Overall progress in task button on Windows 7 On Windows 8 On Windows 10, with patches from mirror patch server On Debian 5.0.4 Lenny (WINE) On Mac OS X (WINE)


Do not provide mirrors for the downloads below, you will end up with an outdated version quickly. Do not hot-link to the downloads either for the very same reason. Link to this section. Thank you.

Latest release

kRO RAG (140KB, 32-bit) (168KB, 64-bit)

Bundle ( bRO, iRO, jRO, kRO & twRO ) (1010KB, 32-bit) (1236KB, 64-bit)

Previous versions

Use of these is at your own risk. They are mainly for archaeological research.