I'm pretty sure you can, but you have to download separate versions of each Topaz programme. That said, I don't believe you cannot use Remask plugin in Lightroom. It needs layers apparently.
As I remember, I also had to download and install a programme called Topaz Fusion Express 2, before installing anything into Lightroom. This is the bucket that all the other Topaz bits are loaded into, and which appears when you click on Photo/Edit In on the Lr menu bar. It opens up a further drop down from which you can make a choice of installed Topaz modules.
Once you have installed all you want in Lightroom; open up the second lot of (duplicate) Topaz downloads and choose Ps or PsCC as your programme of choice and they will appear in the Filter dropdown.
Hope this helps. its some time since I went through the Topaz rigmarole.
" That said, I don't believe you cannot"
What nonsense! It should of course read - " That said, I don't believe you can"
Lightroom vs photoshop. I've never used plug ins in the past. Purchase completed several weeks ago but can't decide where to download. Is it possible to use in more than one program? Yes, I posted to topaz forum without answer so I'm back at Adobe!
Topaz Plug-ins run in either or both Lightroom and Photoshop, Rockshead is correct in saying that ReMask cannot be called from Lightroom though.
If you have Lightroom you will need to download and install Topaz Fusion Express from http://www.topazlabs.com/downloads in order to launch the plugins from Lightroom.
Thank you . Appreciate much the information!
Cool! I thank you!