Unable to update from Version 3.1.21 to 3.2.1

When updating it get stuck at 20% and I get this error :
Not able to download core

Hi Abdelaziz,

"Not able to download core" at 20% means the server could not fetch the
update package from api.akaunting.com, or could not write it to disk.

Please check these:

1. Outgoing HTTPS (443) access to api.akaunting.com must be open — many
shared hosts block it or sit behind a proxy/firewall. Test from SSH:
curl -I https://api.akaunting.com

2. The download has a 50 second timeout. On slow connections, also raise
max_execution_time and memory_limit (256M) in php.ini.

3. storage/app/temp must exist and be writable by the web server user:
chmod -R 775 storage bootstrap/cache

4. Enough free disk space for the package.

If the web UI still fails, run the update from the command line — it gives
the real error message:

php artisan update:all

Please share the output here if it fails.