can't install theme

Hello,

after some bad manipulation found my self reinstalling everything, changed from wampp to xampp, re installed wordpress and now trying to re install my theme.

However when I try to upload the file i get this error message:

“Warning: POST Content-Length of 8608261 bytes exceeds the limit of 8388608 bytes in Unknown on line 0

Are you sure you want to do this?”

I feel like it’s a memory limit issue, though I am not sure
I couldn’t find my php.ini file, tried to make one and put it in wp-admin directory with the limit changes but didn’t work ( not sure I that was the right location ) I was unable to find it anywhere in xampp or wordpress directories.

any ideas?
thanks