Question:
These are the errors that appear when I open Unity:
Assets/_CompletedAssets/Scripts/Helpers/RandomParticlePoint.cs(12,9): error CS0619: `UnityEngine.Component.particleSystem' is obsolete: `Property particleSystem has been deprecated. Use GetComponent<ParticleSystem>() instead. (UnityUpgradable)'
Assets/_CompletedAssets/Scripts/Helpers/RandomParticlePoint.cs(12,24): error CS1061: Type `UnityEngine.Component' does not contain a definition for `Simulate' and no extension method `Simulate' of type `UnityEngine.Component' could be found (are you missing a using directive or an assembly reference?)
And when I put a script:
Please fix compile errors before creating new script components.
Answer:
The first mistake is that you're using an old project, and you haven't converted it to work in Unity 5.
The second is similar, the difference is that it calls a method and doesn't find it.
When you answer which project you're trying to run, I'll explain what you need to do to make it work – if at all possible, as some very old projects are way out of date and the work to solve would not be plausible for a stackoverflow answer (but not should be the case, this error is common in version 4 projects which is newer).