Install DTTG 3 beside v2 without automatic database connection

I’m also dealing with another problem (Incomplete sync in DTTG3? - #15 by BLUEFROG) and don’t want to endanger the files that I downloaded already. Therefore I didn’t even install v3 on my phone, yet. Reconnecting the database with the sync store afterwards might render some files in both v2 and v3 inaccessible. I’d rather not risk that as long as I have no idea what the problem could be.