In case you need to download global Protect client, other than on public Firewall IP here it is relative procedure that you should follow:
- Customer Support Portal
- Login with valid support account
- Updates --> Software Updates --> Global Protect Agent for Windows64 --> GlobalProtect64-6.x.y.z.msi
https://knowledgebase.paloaltonetworks.com/KCSArticleDetail?id=kA10g000000PNlXCAW