Yes, there are two binaries for the plug-in, one with a dll extension is the VST2/PC version, one with the vst3 extension is the VST3 version. It has been some time since I ran the installer. I am guessing the file that was in C:\Program Files\Cakewalk\Vstplugins was actually CA-2ALevelingAmplifier_64.dll the VST2/PC version. Hopefully these directory layouts will me informative.
On my machine CA-2A is installed like this:
32bit VST2/PC installed in "C:\Program Files (x86)\Cakewalk\Vstplugins\CA2ALevelingAmplifier"
CA-2ALevelingAmplifier.chm
CA-2ALevelingAmplifier.pdf
CA-2ALevelingAmplifier_64.dll
RegHelp.exe
Registration.html
and a Resources directory
32bit VST3 installed in "C:\Program Files (x86)\Common Files\VST3\CA2ALevelingAmplifier"
CA-2ALevelingAmplifier.pdf
CA-2ALevelingAmplifier_64.vst3
RegHelp.exe
and a Resources directory
The 64bit VST2/PC installed in "C:\Program Files\Cakewalk\Vstplugins\CA2ALevelingAmplifier"
CA-2ALevelingAmplifier.chm
CA-2ALevelingAmplifier.pdf
CA-2ALevelingAmplifier_64.dll
RegHelp.exe
Registration.html
and a Resources directory
The 64bit VST3 installed in "C:\Program Files\Common Files\VST3\CA2ALevelingAmplifier"
CA-2ALevelingAmplifier.pdf
CA-2ALevelingAmplifier_64.vst3
RegHelp.exe
and a Resources directory