Does the Setup Wizard complete successfully? If so, you can ignore this php error. Your web host has restricted using the set_time_limit() function that is used in the BPS Setup Wizard. The set_time_limit() function is used to increase the script execution time to 300 seconds to allow extra time for the Setup Wizard to complete.
https://www.php.net/manual/en/function.set-time-limit.php
set_time_limit — Limits the maximum execution time
Set the number of seconds a script is allowed to run. If this is reached, the script returns a fatal error. The default limit is 30 seconds or, if it exists, the max_execution_time value defined in the php.ini.
When called, set_time_limit() restarts the timeout counter from zero. In other words, if the timeout is the default 30 seconds, and 25 seconds into script execution a call such as set_time_limit(20) is made, the script will run for a total of 45 seconds before timing out.
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