License for Cloud and Automation Suite upgrade to Hybrid Cloud Management

Hello experts,

We are currently using CSA 4.6/OO 10.51. We want to upgrade to CSA 4..99. Upgrade steps are as follows:

4.6 > 4.8 > 4.92 > 4.99. Since CSA 4.60 is the last available version in Cloud and Automation Suite, it seems that we have to upgrade licenses to HCM. Please confirm and tell me more, is it free or we need to pay for CSA/OO upgrade.