You can easily download custom extensions and transfer them from one company to another.
Go to Administration> Extension. Click on the gear icon next to the name.
On the page that opens, in the upper right corner, click the Export button.
In the window that opens, click Start export.
At the first export step, the extension is checked for links to global system objects.
If such links are detected, a corresponding notification will be displayed. You will not be able to export the solution until the links are removed manually.
If there are no links to global objects, the following notification appears:
To continue exporting, click Next.
The extension will be exported to a file. To save the file to your PC, click on the link in the window that appears.
Later you will be able to import the file to another company.