I tested this on a Playstation Vita using both TN-V and ARK (3.55 firmware).
TN-V:
Install like you would on a normal PSP using VitaFTP to upload the files as appropriate.
ARK:
Same as TN-V however you instead use PLUGINS.TXT inside the ARK_12345 savefile.
Line should be as follows (since format is different from normal)
umdemu,ms0:/livepatch/livepatch.prx,1
I tested livepatch using the obvious effects of the unstretch live patch against an unmodified Final Fantasy Tactics: WOTL CSO.
TN-V:
Install like you would on a normal PSP using VitaFTP to upload the files as appropriate.
ARK:
Same as TN-V however you instead use PLUGINS.TXT inside the ARK_12345 savefile.
Line should be as follows (since format is different from normal)
umdemu,ms0:/livepatch/livepatch.prx,1
I tested livepatch using the obvious effects of the unstretch live patch against an unmodified Final Fantasy Tactics: WOTL CSO.