RagnarokOnline Patcher Lite (c) 2009-2017 Ai4rei/AN

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 for kRO (stable) Download (112 KB)
RO Patcher Lite for kRO RE (stable) Download (112 KB)
RO Patcher Lite Help 2.4.5 (incomplete) View Online


[2017-03-03] Release

This release fixes incorrect handling of mirror failures introduced in last release.

[2017-01-25] Seemingly missing files and random RO client crashes after patching

After updating a Ragnarok installation with the official patcher or with RO Patcher Lite 2.4.7 or older, the following symptoms can occur:

  • the client crashes either during start-up or in-game
  • the client reports missing files
  • sprites or textures appear corrupted

This can be caused by too large GRF archive. The RO client and most GRF tools cannot handle archives of more than 2 GB in size and depending on the archive layout and the file being requested, the above issues may occur. The issue can be remedied by repacking the GRF archive with the command line option /repak or with GRF Diet Plan. You might want to update to RO Patcher Lite 2.4.8 or newer, as these automatically repack the archive when it reaches the limit.

[2017-01-15] Release

This release improves download performance and stability, and fixes minor UI glitches and memory leaks.

[2017-01-14] Statistics

The collected usage data can be viewed in some fancy graphs now (updated weekly). Also belated Happy New Year, there are some updates coming in the next days.

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.


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) Nightly release with plug-in debug messages in DebugView Nightly RSU/2.0 with basic skin support disguising as official patcher Liniris (alpha), console version for BeOS, Unix and Linux Manual patching with RO Patcher Lite (YouTube Video)


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 (112KB)

kRO RE (112KB)

Full Bundle ( bRO, fRO, iRO, idRO, jRO, kRO & twRO ) (1.3MB)

Release Packages with Plug-in Support

Purewhat's this? (90KB)

Latest nightly (untested) NIGHTLY (111KB)

Plug-in Packages

Plug-in SDK (documentation)

2.0 (5KB)
1.0 (3KB)

Generic Sample (genplug) + Source against SDK 1.0 (3KB)

External Translation (i18n) against SDK 1.0 (5KB)

External Patch Information (ipatch) against SDK 1.0 (5KB)

Patch News [Html Version] (panhtml) against SDK 1.0 (4KB; ScreenShot)

Patch News [Text Version] (pantext) against SDK 1.0 (2KB; ScreenShot)

Previous versions

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


You are encouraged to use the bbs for submitting translations and patch information packs, requesting support or reporting bugs. Feedback on RO Patcher Lite, whether positive or negative, is more than appreciated.