Jolla phone and 5.2.0.17, I downloaded the latest version from Chum (3.5.1). Everything else seemed to work but for navigation Pure maps didn’t find route. Either in maps from Here or in the default option. With Here maps the map itself seemed to work and render correctly. OSM scout installed.
Deleted that and installed latest version from Jolla store (3.4.2). With this the default map works with the routing, but Here maps show only white blank. This is probably due the support for HERE v3 API maps introduced in version 3.5.0. In 3.5.1 there was some “[sfos] Workaround for SFOS 5.1”. Don’t know what that actually means. Releases · rinigus/pure-maps · GitHub
@rinigus what is currently best way to install Pure maps for Jolla phone (or any with SFOS version 5.2)? Would love to use Here maps with working routing. Sandboxed app wouldn’t hurt either so can we hope to see newer release in Harbour also at one point? 
PS. thank you for this stunning app <3