I believe that it was just the 64-bit version. See their twitter reply:

https://twitter.com/piriform/status/910098222051446784

'The 64-bit version of CCleaner v5.33.6162 was not affected but we encourage all users to update to the latest version, 5.24.'

I thought about doing something like this in the past, did you find this to be relatively profitable? Was it something that a lot of people wanted?

No, it's a terrible space. Pick something less noisy and with fewer competitors. Like log management. ;)

Just a bit of curiousity - how exactly did you wind up in Poland? Working on a start up?

Working as a Video Games Developer.

Also Polish by birth and wanted an easier way to travel around Europe.