I install LCPDFR 1.0 automatically, everything is fine. When I try to play by myself in single-player or with a friend in multiplayer when I press ALT+P, it does not start. I tried everything, and am not familiar of how to "forceduty". Would someone please be able to help me with this issue?

Could I see a screenshot of your GTA IV directory?  Also, I recommend  you using the manual installation package instead of the automatic installer. 

Sure! Here it is down below:

 

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Try using the manual installation package instead, here's a tutorial (>www.lcpdfr.com/topic/25947-how-to-manually-install-lcpdfr-10-using-the-manual-installation-package/). You can replace any files if needed. Also, you will need to run both exe's as administrator, by going to the GTA IV folder, right click on GTAIV.exe, Properties, Compatibility and select 'Run this program as administrator', do the same exact thing to the LaunchGTAIV.exe.

 

Also, say hi to Casper from me :p

Thank you, I also have a problem with ELM v7. At times it does not turn on at all, even if I spam J,K,L or other keys. Can someone please help!

Are you using the simple native trainer? 

Yes I am, is that currently why? And how do I remove the Native Trainer files, without deleting everything.

You don't have to delete it, you just have to make sure that the trainer keys are disabled by going to your GTA IV folder, open trainer.ini, hit CTRL+F, type in KeyBindingsDisabled=0, click on Find Next and replace 0 with 1. This should solve your issue.

Thank you very much!