The current sPortable release is for Skype Classic 7.x which has now been deprecated by Microsoft. This updated release aims to update sPortable to the new Skype for Desktop 8.x series. I don't think your existing settings will be used.
Download sPortable 184.108.40.206 Dev Test 2
1+60MB download / 180MB installed
2018-03-19: 220.127.116.11 Dev Test 2 - Updated version
2018-03-18: 18.104.22.168 Dev Test 2 - Updated version, disabled automatic upgrade
2018-03-05: 22.214.171.124 Dev Test 1 - Initial Release