Since the Archive version lacks the Reading Lessons (Cyrillic script), you must supplement.
While Pimsleur is unmatched for speaking confidence and accent reduction, it is not a complete language solution. Russian requires a multi-pronged approach. The Cyrillic Obstacle pimsleur russian internet archive
If you are using the lessons found on the Internet Archive or the official app, follow these rules to ensure the Russian actually "sticks": Since the Archive version lacks the Reading Lessons
Russian grammar is famously complex, relying on six noun cases that alter word endings. Pimsleur teaches these patterns implicitly, but many analytical learners find themselves confused without explicit grammar rules. pimsleur russian internet archive
Mastering Russian on a Budget: How to Use the Pimsleur Method via the Internet Archive