Use https://bridge.octa.space Ensure that you have coins to pay transactions fee for destination network

OctaSpace is a fair launch project, meaning there were no pre-sale, pre-allocations, VC's, or ICO's.

If application starting first time on selected machine it must be downloaded first. Depends on application size it may take some time. While application downloading session do not charged.

No, OctaSpace does not offer the option to withdraw your unused balance after depositing funds into your account. When you add funds to your account, these credits are non-refundable and can only be used for OctaSpace services.