Dear Girmay Gezae,
1. About Template package, you have to install Joomla firstly, then install sj_financial_templates _j31 _v1.0.2.zip in backend.
2. About extensions, after you download sj_financial_extensions _j25-j31 _v1.0.2.zip, you have to unzip it, then install every module.
3. About installing the template quickstart, please choose 'Install English(GB) Sample Data' in last step. You can refer the user guide for quickstart installation:
www.smartaddons.com/joomla/templates/template-user-guides/721-sj-plus-template-userguide
Thanks!