Functionality:

Layer management
Isolate and restore layer groups, as well as set line types and weights.
Hidden lines
Use the automatic geometry update feature when making changes. Minimize manual redrawing.
More than 700,000 standard parts and elements
Create accurate drawings using standard components.
Component generators and calculation modules
Analyze projects efficiently, including shaft generators, springs, belts, chains and cams.
Documenting 3D CAD models
Detail the models of Inventor parts and assemblies.
Repeated use of tools for detailing engineering drawings
Use intelligent drawing tools for mechanical engineering design.
Library of custom components and publishing capabilities
Creating and saving custom components.
Preview of command execution results and context menus
Preview of the results of the execution of the pairing, chamfering and offset commands.
The AutoCAD Mobile app
Use the capabilities of AutoCAD wherever you are.
Intelligent dimensions for mechanical engineering
Create dimensions using simplified dialog boxes.
Support of international design standards
Produce documentation based on design standards.
Associativity of item numbers and specifications
Automatic creation of lists of parts and specifications.

Build Features:

The assembly is based on the original Russian and English distributions combined into a single package, from which everything that is not directly related to the installation of the Mechanical add-in has been removed.
Since there was no so-called "classic interface" in Mechanical by default, I considered it possible to restore it for the suffering (see screenshots 3 and 4).
The assembly is spared from the problem that some have when connecting an image via a virtual drive, the installer sometimes required another disk.
Everything necessary for the treatment, including detailed instructions, is located inside the image in the Crack folder.

Treatment procedure:

Install Mechanical Addon for Autodesk AutoCAD 2020.
Attention! It's just an add-on. For it to work, AutoCAD 2020 must be installed on the computer. Moreover, the language of the source program and the add-in should not differ.
Copy the keygen from the Crack folder to the hard disk. If you don't, it won't work correctly.
Run the program. A window opens with a suggestion to select the license type. At the bottom of the window there will be a line with an additional activation offer using a serial number. Choose this option. In the new window, agree to the privacy statement. In the licensing window that opens, click "Activate" (Activate). In the next window, use 111-11111111 as the serial number and 206L1 as the product code, then click "Next" (Next).
In the window that opens, you will be notified that your serial number is invalid. Press "Back" (Back) and confirm the cancellation of the operation. The licensing window will open again, where you will again need to click "Activate" (Activate). In the next window, use 111-11111111, 222-22222222 or 333-33333333 as the serial number and 206L1 as the product code, and click "Next" (Next). In the window that opens, select "I have an Autodesk activation code" (I have an activation code from Autodesk).
On behalf of the administrator, run the keygen on the hard disk (right-click on the file and select "Run as administrator" in the drop-down menu) and click the Patch button in the keygen window. A window should appear with the message "Successfully patched".
In the Request field of the keygen, copy the Request Code from the Autodesk licensing window, replacing it with the inscription "Paste Request here". After that, click Generate and transfer the result from the Activation keygen field to the Activation Code field of the Autodesk licensing window. Click "Next" (Next). A message about successful product activation should appear.
Attention! The generated Activation Code is slightly longer than the field allocated for it in the keygen. Try not to lose some of the characters when copying. But I also want to note that this code is shorter than the space allocated for it in the Autodesk licensing window. The sixteenth field remains blank, and the fifteenth contains only one character - the letter Z. This does not prevent activation.
Enjoy the registered version of the product!

Image sizes and CRC:

Image size: 560 MB (588,052,480 bytes)
MD5-image sum: 1c3f4e979fa78340d57bd47328ed9530
SHA1-sum of the image: e435edb4ca64eee8ba8e3ee6a776da7db1170024