Updated December 2021:

Improved RAW support,
Updated documentation.

Meet the brand new tools – Enhanced profiles to use in Lightroom (Cloud based) 1.3/ 6.0 and later, Lightroom Classic 7.3/ 12.0 and later, Adobe Camera RAW 10.3/ 15.0 and later, Adobe Photoshop CC 2018 v19.1.3/ 2023 v24.0 and later with Camera RAW plug-in, Lightroom Mobile 1.3/6.0 and later (via sync).
!!! Not compatible with the older versions of Lightroom (1-7.2, like CC2015.5 and ACR below 10.3), it’s not possible to recreate the profiles as the presets, so please check the version of the software before buying. Again, you need April 2018 release (Lightroom v1.3, Lightroom Classic v7.3, ACR 10.3) or later. Sorry No Refunds.
Simulate B&W Conversion using L.a.b. Calculations directly in Lightroom and Adobe Camera RAW.
Preview, select and Fine tune your Black & White convertion of RAW and Non-RAW images and footages.
Black & White Conversion using Calculations is one of the most powerful tools for Black & White conversion.
What Calculations does is, it takes any two channels among the three (Lab) and masks one with the other using the selected blend mode.
Better work on the images with the visual elements of composition like Leading lines, Reflections, Symmetry, Framing, Textures, Patterns, Viewpoint or Perspective, Shadows, Balance of positive and negative spaces etc.
Please check the colors first, if you have more Reds and Greens, the better choice will be Channel Calculations profiles with A, and with Yellows and Blues please select the profiles with B.
In the 1940’s, Richard Hunter introduced a tri-stimulus model, L.a.b., which is scaled to achieve near uniform spacing of perceived color differences. While Hunter’s Lab was adopted as the de facto model for plotting absolute color coordinates and differences between colors, it was never formally accepted as an international standard.
Regardless of the which color space name you call it, it’s important to know what L, a, and bstand for.
L: Lightness
a: Red/Green Value
b: Blue/Yellow Value
Lightroom Mobile users please read:
https://helpx.adobe.com/lightroom-cc/kb/faq-install-presets-profiles.html
The List of Raztrend LAB Calculations profiles:

L L Multiply
L L Mult Mask L
L L Mult Mask L Inv
L L Mult Mask a
L L Mult Mask a Inv
L L Mult Mask b
L L Mult Mask b Inv
a L Multiply
a L Mult Mask L
a L Mult Mask L Inv
a L Mult Mask a
a L Mult Mask a Inv
a L Mult Mask b
a L Mult Mask b Inv
b L Multiply
b L Mult Mask L
b L Mult Mask L Inv
b L Mult Mask a
b L Mult Mask a Inv
b L Mult Mask b
b L Mult Mask b Inv
L L Color Burn
a L Color Burn
b L Color Burn
L L Screen
L L Screen Mask L
L L Screen Mask L Inv
L L Screen Mask a
L L Screen Mask a Inv
L L Screen Mask b
L L Screen Mask b Inv
a L Screen
a L Screen Mask L
a L Screen Mask L Inv
a L Screen Mask a
a L Screen Mask a Inv
a L Screen Mask b
a L Screen Mask b Inv
b L Screen
b L Screen Mask L
b L Screen Mask L Inv
b L Screen Mask a
b L Screen Mask a Inv
b L Screen Mask b
b L Screen Mask b Inv
L L Overlay
L L Overlay Mask L
L L Overlay Mask L Inv
L L Overlay Mask a
L L Overlay Mask a Inv
L L Overlay Mask b
L L Overlay Mask b Inv
a L Overlay
a L Overlay Mask L
a L Overlay Mask L Inv
a L Overlay Mask a
a L Overlay Mask a Inv
a L Overlay Mask b
a L Overlay Mask b Inv
b L Overlay
b L Overlay Mask L
b L Overlay Mask L Inv
b L Overlay Mask a
b L Overlay Mask a Inv
b L Overlay Mask b
b L Overlay Mask b Inv
L L Soft Light
L L Soft Light Mask L
L L Soft Light Mask L Inv
L L Soft Light Mask a
L L Soft Light Mask a Inv
L L Soft Light Mask b
L L Soft Light Mask b Inv
a L Soft Light
a L Soft Light Mask L
a L Soft Light Mask L Inv
a L Soft Light Mask a
a L Soft Light Mask a Inv
a L Soft Light Mask b
a L Soft Light Mask b Inv
b L Soft Light
b L Soft Light Mask L
b L Soft Light Mask L Inv
b L Soft Light Mask a
b L Soft Light Mask a Inv
b L Soft Light Mask b
b L Soft Lighty Mask b Inv
L L Vivid Light
a L Vivid Light
b L Vivid Light

In the package you will get:

90 Enhanced profiles (.xmp) compatible with Lightroom 1.3+, Lightroom Classic 7.3 + , ACR 10.3 +, Lightroom Mobile,
Zip archive to use in Lightroom (Cloud) 1.4, 6.0+, Lightroom Classic CC 7.5, 12.0+, ACR 10.3, 15.0+,
Installing and Using Single or Multiple Enhanced profiles in LR and ACR (.pdf).

How to use:

Profiles are non-destructive and can be changed without loss of quality.
Suitable for RAW and Non-RAW (JPEG, TIFF, PNG etc.) images.
Suitable for Color and Monochrome images.
Can be viewed in the Preset Browser.
You may make the finishing touches as well.
Compatible with Mac, and PC.
Use of multiple profiles in your workflow.
Easy to install.

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