When installing theme on prestashop, people may face with a problems that file is larger than its permission.
You should set the maximum file size for some steps. It seems to be very easy done by our performing the following our guideline with 2 OPTIONS.
To set the max file attachment size in PrestaShop 1.7
You have to edit the php.ini file for your PHP install. This can only be done if you do have access to your server’s PHP configuration files. If not, ask your host.
If you do have access to php.ini, open it and edit the following lines:
post_max_size = [anything]
upload_max_filesize = [anything]
If you want to set the maximum to 100 megabytes, change their values to
post_max_size = 100M
upload_max_filesize = 100M
Step 1: Log into your PrestaShop 1.7 admin dashboard.
Step 2: Choose Advanced Parameters -> Administration
Find Upload Quota, you will see the field named Attachment maximum size. Set the max size you desire in the field in Megabytes.
And Save for your changes!!!
Finally, restart the web server to take your changes into account.