Hi. I'm new to SONAR. I've been using Cubase for years, but after a spell away from music, I jumped back in with a Jupiter 50, a Gaia, a KC800, and SONAR X1 LE came with it all. I've just bought the Arturia V collection in the sale, but for the life of me I can't get SONAR to see it anywhere. Would anyone have any ideas? I'm probably looking in the wrong place. (Windows 10. MAC user for years so not used to the windows format).

Try a search for modular v2.dll or mini v2.dll or any of the file names. Once you find where they are add the folder to the vst scan.
 
Hope this helps

Be sure the VSTis are in the scan directory for Sonar. 

I also just bought Arturia V collection this last week and had the same problem.  Following registration the Arturia AnalogLab was all working fine, but the VSTi's were not showing up correctly, even using the default 'All' plugins rather than my custom plug in set.  I noticed that some of the instruments (can't remember which ones though) showed up under the VST3 folder.  They all displayed in the plug-in manager, but oddly some of them were in blue rather than green (or the other way round).  I couldn't fine anything in the docs to tell me what this meant - Fast Bikder Boy will know I'm sure!).
 
Anyway, I then removed all of the Arturia stuff from the plug in manager, made sure the VST scan folder was set specifically to include the 64-bit '86' rather than 'x86' folder, did a full rescan and tried again.  I think I did a full system shut down/restore as well.  And suddenly they all re-appeared and away I went.  Stick with it - I wish I could be a bit more specific on the recipe, but it will work.
 
As an aside, I'm really impressed with the Arturia vintage synths.  So much so I also picked up the KeyLab25 controller as well because I'm now just spending hours synthesizing sounds and pretending to be Edgar Froese! Love the ARP2600 and Solina.  But the Jupiter 8 - which was the synth I always wanted to own in the 80's has left me sadly dissapointed. 

Hi
I've had the V Collection for a number of years now. Excellent synths, if a little resource hungry at times.
When installing make sure you just choose the VST2 (x64) version of every synth except for AnalogLab which is OK as a VST3. (Uncheck the rest apart from maybe the standalone versions)
Always had issues with Arturia and VST3, AnalogLab being the only synth that seems to work as VST3.
Also make sure you set the plugin folder to your Cakewalk plugin folder (C:\Program Files\Cakewalk\Vstplugins) during the installation (for x64 plugins anyway).
 
Not just simple one click install I'm afraid.
 
Cheers