What happened to Jinja < 1?
Before Jinja 1 there was a template engine too with the same name. Beside the name and the same maintainer those two projects don’t share a single line of code. If you have an application using Jinja < 1 you should try to make it Jinja 1 compatible. If that's not possible, the old project is still available as 0.9-maint in the old Jinja subversion repository.