@JustChilling
You may have 2 options:
1. Utilize the trial license of 2011, 2015 and maybe 2019 to convert your old file prior to opening it on QBD 2021.
2. Purchase a 3rd party upgrade service
Utilize the trial license of QBD 2021 to open the converted file. Then you may purchase a one time license of QBD 2021 Pro for 1 user worth $399 or Premier for 1 user worth $499.
