Any suggestion for a reliable VST-bridge, allowing me to run 32-bit VSt-FX in Sonar, please?
And also a few hints how to install (which folder), and use  them?
Thankx.

afaik there are two today. BitBridge (Sonar) and Jbridge paid - like 29.00 buck or something.
There are two camps both with their disciples. If you don't like either - that's a drag.

you can run 32 bit plug ins in Sonar.
not sure what you mean ? are you having issues running 32 plug ins in Sonar ?
I run quite a few as of right now. no issues.

I am a bit confused by the question as bitbridge is an integral part of Sonar and should work right out of the box.

That said some VST don't bridge well, in my experience these are either ancient synth-edit things or VSTi that use samples. The alternate third party application JBridge may help with these problem items.

What you can't do easily is bridge 32 bit DX effects and instruments.

I think the best answer I ever heard about this was from Wolfgang Kundrus, who was involved with Cubase and the early days of Studio One. He was answering questions at PreSonuSphere and someone said they had just bought the 64-bit version of Studio One (which doesn't have a bridge) and wanted to know the best solution for running 32-bit plug-ins.
 
Wolfgang's answer: "Tell the manufacturer to make a 64-bit version."
 
Bridges are like ASIO4ALL - brilliant kludges, but ultimately, kludges. That said, I've had good results with BitBridge but have also made an effort to convert everything to 64-bit.

Not using 32bit plugins is definitely preferable and will give you a far better Sonar experience. That said, if you must use 32bit plugins, some work reasonably well under bitbridge (included in Sonar) and others work under jbridge (purchased).  They are your only two options, and to run a variety of 32bit plugins it is certainly best to have both.  Once you install jbridge, you can configure which bridge to use on a per plugin basis (or globally for that matter) under utilities> Cakewalk plugin manager>vst configuration > plug-in properties. Just try both with each plugin and see which works best for you.
 
Again though, it is far better if you can update to 64bit plugins:)

How can I get Cakewalk to make a 64bit version of sfz.exe?
 

J-Bridge has given me better results than Sonar itself (BitBridge) but I've been all 64 bit for a few years now and that's been a lot better than J-Bridge.

Thankx for all your answers.
Well, there are a few 32-bit VSt plugins which seem to already work in my Sonar right now, but there are also some which do not run. In one case, I really had asked the manufacturer if there's a 64bit-version of that one, but he declined. He was busy in different affairs right now, he answered. 
If I was a programmer, I'd give it a try to convert those not yet running VSts to 64bit, but: I am not. I can't (yet). Or is that a simple job to do, and what would I need for it?

Apparently, JBridge is only supported up to Win8
 
http://www.syntheway.com/jBridge.htm
Go down to the bottom of the page
 
I also struggled to find it. I couldn't find a link on their main page.