Is it worth having the 64bit version and if it is can I install it over the 32bit version without uninstalling it first?
@OP: Let see. I used to run Tixati 32-bits in Win XP 32-bit and 64-bits in XP 64-bit myself. I don't really find any noticable difference between those 2. Normally I believe in coder/programer who create Tixati, each version for each flatform was optimized. But recently, I'm not so sure about that at all.
I read a topic in this forum few weeks ago (don't remember link 'coz lately I don't often visit here). And a person say that he found out that 32-bit is more stable and smooth running than 64-bit one, especially in his 64-bit system. And he said that he got hang/not-responding issue solved by using 32-bit version. So maybe there's something about that... I'm not sure about what he said. But neither I can about Tixati coder...
We see Tixati has got it own problem for years and nothing going to be fixed at all. Maybe coding aspect of Tixati 64-bit not that optimized and maybe affect performance or smoothness on user system... just maybe... (They have got problem that they didn't fix for very long time so it's safe to assume that code optimizing between flat form not that good? isn't it?)