I payed for Ilustrator and after instaling adobe wants me to pay for it again

use @Monika Gause 's link first.  only if it fails and IF your account shows an active subscription should you proceed to these steps - 

https://helpx.adobe.com/enterprise/kb/resolve-trial-and-license-expired-errors.html

if that fails, https://helpx.adobe.com/download-install/kb/adobe-license-issues-keychain-credential-mgr.html

below are solutions some users reported:

if those all fail, change your cc language. eg, try international english - https://helpx.adobe.com/creative-cloud/kb/creative-cloud-trial-mode.html

if that fails, change the install location

Does this perhaps help? https://helpx.adobe.com/manage-account/kb/stop-creative-cloud-trial-mode-after-purchase.html