So, I have a synth made with Reaktor 6 that works just fine but also downloaded some synths made with Reaktor 5 and those don't give me sound. Is the fact the synth was made with an older version the problem?
nope. R5 stuff works just fine in R6
Most probably you didn't download an actual synth but rather a sampler, or sequenced synth, or sequencer etc.
For those devices you need to click the "play" button, while others have a different purpose (for example, a sequencer) and do not produce any sound at all.
But, until you tell us the names of those "synths" (preferably with a link to them) we are just guessing here.
@Sunborn
These are all the synths I tried, only one synth works, and it's the Nord 2X.
Nord Rack 2X | Entry | Reaktor User Library
Korg Ms 20mini | Entry | Reaktor User Library
ODYSSEY I | Entry | Reaktor User Library
-Oberheim 4-voice Synthesizer- | Entry | Reaktor User Library
Alkesynth V2 | Entry | Reaktor User Library
Xpander | Entry | Reaktor User Library
OB-Xb | Entry | Reaktor User Library
"only one synth works, and it's the Nord 2X"
Probably because I made it… 😋
For the rest, i don't know, you are on your own. They should work. But some of them are really archaic. You can find better and newer versions if you search more.
And a piece of advice: If you really want to get help in this forum i suggest you to use the "vote down" option for really important reasons and not against the people who are trying to help you! 😠
Must have been on accident, that's my bad. Thanks for trying to help me.