I can see this in his debug.log file:
2021-01-29T12:47:28Z ERROR: DeserializeFileDB: Failed to open file K:\Bitcoin qt\Database Wallet\anchors.dat
This is benign and expected.
What should happen if you stay at the version v0.20.1 and not go to the v0.21.
I"m have started again about 3 weeks ago with the version v0.20.1 after troubles with my computer . Now i am still 4 years and 16 weeks behind. Block 235195 That goes very slow. I get the mension that it will still take 6 weeks to have completend the download.
I am affraid if i go to another version , i have to start completely again.
Please open a new thread for your issue. Do not hijack other people's threads.