Migrating mySql databases from 2.2. to 3.1.7 (6 replies)

I just migrated from WampServer 2.2 to 3.1.7.

1. I uninstalled WampServer 2.2: everything was removed but content of www and data in mysql folder
2. I installed WampServer 3.1.7
3. I moved the content of data to mysql5.7.24
4. I made some change in old aliases and confs to match new Apache requirements
5. I started WampServer

Wamp is orange now, 2 services started out of 3. It looks like MySql has problems to start:

wampmysqld64: Table 'mysql.plugin' doesn't exist
2019-04-03T09:13:56.677886Z 0 [ERROR] Can't open the mysql.plugin table. Please run mysql_upgrade to create it.
2019-04-03T09:13:56.681875Z 0 [Warning] Gtid table is not ready to be used. Table 'mysql.gtid_executed' cannot be opened.
2019-04-03T09:13:56.688024Z 0 [Warning] Failed to open optimizer cost constant tables

2019-04-03T09:13:56.690381Z 0 [ERROR] Fatal error: Can't open and lock privilege tables: Table 'mysql.user' doesn't exist
2019-04-03T09:13:56.691409Z 0 [ERROR] Fatal error: Failed to initialize ACL/grant/time zones structures or failed to remove temporary table files.
2019-04-03T09:13:56.692678Z 0 [ERROR] Aborting

So it looks like I have to initialize something but I do not know how. I tried mysqld but it does noy work:

D:\Server\wamp\bin\mysql\mysql5.7.24>bin\mysqld --initialize
2019-04-03T09:15:58.560464Z 0 [Warning] TIMESTAMP with implicit DEFAULT value is deprecated. Please use --explicit_defau
lts_for_timestamp server option (see documentation for more details).
2019-04-03T09:15:58.565058Z 0 [ERROR] --initialize specified but the data directory has files in it. Aborting.
2019-04-03T09:15:58.565472Z 0 [ERROR] Aborting

Any idea what I have to do to migrate all old databases?