# Download

Download MC Grating Software, release 2026-05-25: the Full and Light x64 installers (either runs in demo mode without a license key), plus the user manuals, the examples and the grating data files, with sizes and SHA-256 checksums.

Canonical: https://mcgrating.com/download.html


Two editions, two installers: Full and Light. Either runs in demo mode until a license key is installed, with one restriction: refractive indices are multiples of 0.5.

## Current release: 2026-05-25

### [MC Grating Software Full x64 (2026-05-25)](https://mcgrating.com/files/MCGratingFull_x64.zip)

41.5 MB · zip

SHA-256 7653c995cb887f2a4d5c50f0a6e061b4f7917e8a0632e5233c106794125545a1

### [MC Grating Software Light x64 (2026-05-25)](https://mcgrating.com/files/MCGratingLight_x64.zip)

39.4 MB · zip

SHA-256 dbaab0713b3af4fcec6910991a6722137af528e3fb92f784ea33550858821aae

See [changelog](https://mcgrating.com/changelog.html) for what changed in each release. Full and Light are separate installers: `setup-full-x64.exe` and `setup-light-x64.exe`. Either installer runs in demo mode without a license key: every feature of its edition works, with one restriction, refractive indices are multiples of 0.5. The license key lifts the restriction; nothing is reinstalled. [Full and Light →](https://mcgrating.com/pricing.html#editions)

To install, run the setup file and follow the on-screen instructions. Some antivirus programs may delete files from MC Grating package. In this case it is necessary to restore these files and mark them as trusted.

- If your license key is not working with new x64 version, please contact us at [mc@mcgrating.com](mailto:mc@mcgrating.com).
- In case of currently installed MC Grating Software version less than 2014-01-09, please manually uninstall it before running setup.
- **Please note that since version 2020-04-15 only x64 bit version will be presented at our website. We suggest all our customers to use it due to higher performance. Please contact us if you still need x32 version.**
- **Please note that since version 2016-11-02 our software doesn't support Windows XP OS due to Intel MKL 2017 requirements.** Please contact us in case you need fresh version of our software compatible with Windows XP OS (older Intel MKL library will be used).
- **Since versions of 2013, all MC Grating Software modules use new licensing technology.** Users of old software licensing technology can simply receive new license key for free by writing us an email.

[System requirements →](https://mcgrating.com/system-requirements.html)

## Demo mode

Both installers, Full and Light, work in demo mode without a valid license key. Demo mode has only one restriction: it sets all refractive indexes multiple to 0.5. For this reason a material catalog can be used only as a reference and refractive indexes can not be set as a variable parameters in optimization procedure. Nevertheless demo mode retains enough flexibility to serve for education and training needs. After obtaining a valid license key the software works without this restriction.

## Manuals, examples and data

| File | Size | SHA-256 |
|---|---|---|
| [Examples-Structures.zip](https://mcgrating.com/files/Examples-Structures.zip) | 0.37 MB | 3dc3dedf155c239de8d4c1e317fcbada7e1f2561551a837e85f1885892c46ed1 |
| [GratingsDataFiles.zip](https://mcgrating.com/files/GratingsDataFiles.zip) | 3.63 MB | 4b2e3a2c638b9b75b1643386909bb01ae13af728ef1bdf607320ea5e1fdf3bb5 |
| [Users Manual 1D Gratings](https://mcgrating.com/files/UserManualMC.pdf) | 0.76 MB | acb37219a3fb10ae4c72f5ee6fc7c53fc383549135a8c6f36054188844e456a9 |
| [Users Manual Crossed Gratings](https://mcgrating.com/files/UserManualCr.pdf) | 0.76 MB | a0155168829d2a4a072da1e37224428c9ac962d29e785c245f5bbb50437f682d |
| [Examples-Description.pdf](https://mcgrating.com/files/Examples-Description.pdf) | 1.31 MB | ba5e560f5b82879d4aa8193b99f23a72b15e3c487ae08fa831ee4c4442be1b56 |

The manuals are the same text as the [online documentation](https://mcgrating.com/docs.html), one PDF per code family; the examples document is reproduced page by page as [step-by-step examples](https://mcgrating.com/docs/examples.html). The [third-party components](https://mcgrating.com/third-party.html) MC Grating uses are listed with their licenses.