Bioequivalence and Bioavailability Forum

Hello dear bioequivalence fellas,

I'm starting my journey testing IVIVC and I've bumped into a wall which is really slowing down my progress.

I'm testing an IVIVC model I've found in the literature which has a high predictive power.
I'd like to predict the in vivo PK profile of my formulation (Extended Release) from which I have biorelevant in vitro dissolution data (the same medium, volume, rpm as the one used in the paper). I also have in vivo data from an IR formulation which I guess it can be used as the UIR function.

I was able to predict the fraction absorbed / time from my formulation using the IVIVC model and the in vitro data mentioned above. I've also fitted equations (Rsquared > 95%) to both my UIR function and fraction absorbed data (Don't know if it helps). Nonetheless, I have little to no clue of how to solve the convolution equation since I'm not a mathematician...

I have no access to WinNonlin nor to other specific software. Can anybody help me pointing on the right direction to move forward and predicting my in vivo PK profile?

Thanks in advance