The request for "Download Aerostat Parseval rar" likely refers to a of a Parseval-type observation balloon.
You can find and download the assembly files for the (Аэростат системы «Парсеваль») in a compressed format (such as .rar or .zip ) on specialized papercraft sites: Download Аэростат Parseval rar
: If searching on Russian sites, use the term "Аэростат Парсеваль бумажная модель" to find the most relevant results. The request for "Download Aerostat Parseval rar" likely
: While you are looking for a .rar file, the actual content will be images (JPG/PNG) or PDF templates that you print on cardstock. Download Аэростат Parseval rar
Сборная бумажная модель Дирижабль - Only-paper
: This site hosts a Parseval Aerostat model (designed by Fedor700) which includes three different scale variants. It provides templates and assembly diagrams for hobbyists.