Hello Emily.
Could you clarify what files you are trying to access?
You can get a 30 days trail license just using this link:
https://www.f5.com/trials
vLabs like F5 Univesity are not available anymore. There are some learning materials that you can access using your partner account (https://f5u.csod.com/).
There are also cloud labs where you can get the whole infrastructure ready to use, but for getting access you need to contact your local F5 representative.
https://clouddocs.f5.com/training/community/
Hope this clarify what you were looking for.
Regards,
Dario.