How to install Serbian voice Jovanka on TomTom Go 750 Live?

Može.

Unpack files from link above. Choose Jovanka or Danica.
There are data92.vif, data92.chk in Jovanka folder. Rename them to data99.vif,data99.chk. Open data99.vif with text editor and change line 2 to data99.chk
Copy those files to Voices folder in TomTom Go 750. If there is no folder Voices, create it.
If necessary, patch with Fast Activate.