I cannot update securitycheckpro component from Vers: 3.3.1 to 3.4 and get as an alert: Fehler beim Aktualisieren von Komponeneten and a warning: Duplicate entry '126.96.36.199' for key 'PRIMARY'
Also if i want to install the whole component.
Is there any hint for this problem?
joomla is 3.9.27
Yes, this is due to a duplicate entry for that value into blacklist or whitelist. Just look for 188.8.131.52 in any of those list and delete all values. Repeat the process if do you get the same error with a different IP.
After that you will be able to update to 3.4 version.