SQF scripts are run differently than SQS ones (engine does not read the extension to decide on the format of the script, except for init.sqf/sqs):
call { [] execVM "scrips\LCD_Timer.sqf" }
Also bear in mind that the targets may not behave the same in A2 as they did in A1 (that is, the blue and red behaved very differently in A1, but in A2 they may work the same or in two entirely different ways). What you need is a target that falls down and stays down (this is how the blue ones worked in A1), rather than one that pops up again (this is how the red ones worked in A1). The actual colour of the targets in A2 is not really relevant.