Installing went fine but the computer won't prompt the Accept button on System Preferences -> Security and privacy -> General tab.
What can I do?
Can you please try the below solution, and let me know if it works ?
After installation of the Mac product on macOS Mojave or later, a red F-Secure (X) icon may appear when running real-time scanning.
This is due to a new security feature, which was been introduced in macOS High Sierra (10.13).
During first time installation, the security feature requires you to allow system software from F-Secure.
Until the software is allowed, real-time scanning will fail.
Once the installation is complete, allow F-Secure software as follows:
Note: The steps described must be performed locally on the machine and not remotely.
Full instructions with pictures: https://community.f-secure.com/psb-en/kb/articles/5688-issue-with-real-time-scanning-after-computer-protection-for-mac-installation-on-macos-high-sierra
In case the mentioned solution above does not work, carry out the following solutions one by one and verify if the real-time scanning could be enabled.
Add F-Secure Team ID (6KALSAFZJC) to the list of approved kext developers by using "spctl kext-consent add 6KALSAFZJC" command in the Recovery mode.
Refer to the following page for more detail information: