About subscriptions renew

Hi,
in my website I've put 3 subscription plan, 2 with a payment and 1 free. I've set the renew manually.
I've this problem: when a paid subscriber finish his period of paid subscription should be go back to the free one, instead the system block him and set his profile not able to enter to the website.

I need to re-able him manually and click on the free subscription... how can I solve this issue?

CBSubs doesn't revert to a previous subscription like that. When you move from one subscription to another the previous is put into an upgraded state showing the subscription has moved on to a new one. One way to have what you're wanting is to use a parent plan. Example as follows.

Plan 1
- Plan 2
- Plan 3

Another option is to use CB Auto Actions to act on subscriptions state change and subscribe them to a different plan automatically. You'd use the below with a CB Paid Subscriptions action.

Plan Active
Global
Triggers: onCPayUserStateChange
User: Automatic
Access: Everybody
Conditions
1: [var3] Equal To PLAN_ID_HERE
2: [var2] Equal To A

Plan Expired
Global
Triggers: onCPayUserStateChange
User: Automatic
Access: Everybody
Conditions
1: [var3] Equal To PLAN_ID_HERE
2: [var2] Not Equal To A

Replace PLAN_ID_HERE with the ID of the plan you want this to act on.

Hi, as you suggested, I've put the 2 paid subscription under the free subscription.

FREE -
PAID 1
PAID 2

Every plan is linked to a different ACL

FREE - REGISTERED
PAID1 - PREMIUM
PAID2 - BUSINESS

The problem is: when an user has the PAID x plan over it become FREE subs, but remain in the group was before:

PAID 1- PREMIUM
When PAID 1 is over the user become

FREE - PREMIUM (instead FREE- REGISTERED) and he can see anyway the protected webiste pages...

How can I solve this?
Thank you

This happens when CB Auto Actions changes their subscription? Is your free plan a free lifetime plan? If so be sure you've configured free lifetime plans to create subscriptions within CBSubs > Settings > Global. If already configured you can try using a Usergroup action in CB Auto Actions to also handle the usergroup swapping by creating a auto action for each plan then using the Plan Active usage shown above to replace their usergroups.