Да, существуют профессиональные надстройки, но для большинства задач библиотек, доступных бесплатно, более чем достаточно. Заключение
GOST Electro for Visio — подробное описание и возможности gost electro for visio 2016 skacat- besplatno
Even if you find a working free version, users report: Step 2: Move to the Visio User Shapes Folder
The specialized library GOST Electro for Visio is a comprehensive set of shapes and templates designed to help engineers and technicians create electrical diagrams in Microsoft Visio 2016 (and other versions) according to Russian national standards (GOST/ЕСКД). Overview of GOST Electro for Visio The library is a paid product, typically costing around for a single-user license. It includes: 2,400+ Shapes It includes: 2
Зачем нужны трафареты ГОСТ для Visio 2016?
If your download is a ZIP archive, extract the files to a permanent folder on your computer. Do not leave them in your temporary "Downloads" folder, as you might accidentally delete them later. Step 2: Move to the Visio User Shapes Folder