Under Section 378(5) of the code of criminal procedure 1973, there is a period of limitation prescribed for appeal against acquittal. If the complainant is a private person then a period of limitation is 60 days from the date of order of acquittal.
The proviso of Section 372 does prescribe the right to appeal by victim in case of acquittal or lesser punishment. It does not provide a period of limitation. Hence in respect of limitation the provision of Section 378(5) shall apply.
If there is any sufficient cause for the delay then you can request the court to condone the delay. Move an application under Section 5 of the Limitation Act for the condonation of delay.