Download the simplified version in the "old" format (instead of the region number you see the name) as text or MySQL dump for Postcalc Light (table postcalc_light_cities). The "old" format will be supported for 2021, then support is not guaranteed.
Link
Map
RestoreView
LinkOSM
API Parameters
Region code regid
44
Alternative region names
Костромская область
Костромская
KOS
Kostroma Oblast
Kostroma Region