MVC1 CROSS FEVER — V2.1 PREVIEW PATCH ONLY

For the complete installation path, download the platform package instead.
It includes the matching four-controller core, install/launch helpers and
controller guide. This smaller archive contains only the patch specification,
Windows CMD and Python patcher; it does not contain a core or a game ROM.

PATCH YOUR OWN PARENT

Use the clean MVC1 Europe 980123 parent. A merged archive is accepted when
all required Euro root members match their names, sizes and SHA-256 hashes.
Extra regional members are ignored without modifying your original archive.
A USA/Asia clone alone cannot replace the required Euro parent members.

Windows: drag your parent ZIP onto MVC1-Cross-Fever-v2.1-preview.cmd.
macOS/Linux: run this command from the extracted folder:
python3 patcher/mvsc_patch.py /path/to/mvsc.zip --spec patch-mvc1-cross-fever-v2.1-preview.json --out /path/to/new-output

The patcher creates mvc1-cross-fever-4p-v2.1-preview.zip and a receipt.
It refuses existing outputs and preserves your input. Python installation
requires a hard-link-capable filesystem such as APFS, ext4 or NTFS; use an
internal supported disk instead of exFAT/FAT or a network share.

The optional-key 20-member parent is accepted for patching. The new matching
RetroArch core requires the full 21-member parent with your original mvsc.key.
Use the platform bundle's installer for that runtime setup; its output is
output/mvsc4p.zip. If using this patch-only result with the matching core,
retain the verified result and copy it as mvsc4p.zip. Do not rename a regional
key, create an empty key, or use a stock two-player core for four-player tests.

WHAT CHANGED AND WHAT REMAINS

Installation validates required members rather than total archive count.
Game member targets, persistent ownership labels and artwork remain exactly
the v2 preview's. C.S's actual archive was unavailable: the 22/48-member
installation controls were constructed fixtures, not his archive.

The generated PowerShell body and Python patcher were exercised on macOS.
Native Windows CMD/PowerShell 5.1, the new matching-core gameplay matrix,
four physical controllers and a four-human network session remain community
checks. No Fightcade four-human support is claimed. Full setup and test limits
are included with the platform packages and on the download page.

No game ROM, key, save state or emulator core is included in this archive.
