You can install XFINITY CRM on XAMP server without any problems. Everything will work good except if no internet connection you wont be able to send emails.
Few changes we need to do in XAMP default installation.
1. Change the .htaccess
RewriteRule ^(.*)$ index.php?/$1 [L,QSA]
to
RewriteRule ^(.*)$ /yourfolder/index.php?/$1 [L,QSA]
2. IMAP extension manually (enable them in php.ini and restart apache).
Try to install again.