When you do Upgrade there is at the early stage a screen that let you choose whether you want to Keep every thing personal, or Not.
Make sure that the Keep you personal stuff and program is checked if you want to keep them.
BTW. The actual Win 10 OS is always a Clean Install. It is only the Additional Installed Programs and your Data files that are kept.
Some of my Work computers takes a day or two to put them back as they were if I do a Total Clean Install.
I installed thus over dozen of Win 10 computers and choose to Keep Program and Data on about eight of them.
That total Clean install are a little more peppy after the installation but when I put back the Apps and the Data that are needed to work there is No Noticeable difference. I even benched marked them one group against the other and there is No significant differences.
The Culture of always Update and Clean Install is More a Cultural Enthusiasts Phenomenon rather than real Functional Technology.
P.S. I do not have Heavy Gaming computers, the issues with them might be different, some are so messy that they need periodically to be Clean Installed even if it is Not an OS Upgrade.
