The plugin doesn't show up in my DAW
A common mistake is to download and install the wrong "bit" version of the plugin. As you will notice, there is 32 bit and 64 bit available. Depending on the combination of your operating system and your DAW, you have to select the correct one, otherwise the plugin won't show up.
Note: A 32 bit software can also run on a 64 bit Windows version, therefore having a 64 bit operating system doesn't necessarily mean that your DAW is also installed as 64 bit. Some older DAWs, like Cubase 5 for instance, were almost only available in 32 bit, but do run on a 64 bit Windows version. Though they need the 32 bit version of the plugin.
If your DAW is installed in the folder Program Files (x86) (with that (x86) at the end), it is a strong indication that it is a 32 bit application, for which you would need the 32 bit plugin version.
If your DAW is installed in the folder Program Files (without (x86)) chances are that it is 64 bit.
Also, taking a look at the about page of your DAW (usually found in Help ➔ About) will most likely tell you whether it is a 64 bit application.
More information about the differences between 32 and 64 bit you can find HERE if you follow the yellow arrow.