The first thing that you should know is that, although the programs are almost identical, the event & membership Data files (PSEvents.dat, PSMembers.dat, etc.) are incompatible.
This means that you need to use a new set of Event Files for EBUScore; you cannot use EBUScore to access events that were created by PairsScorer, and vice versa.
Also, you will need to use a new Player Database. There are instructions below on how you can transfer the information relatively easily.
You can, however, still use any old user movement files.
Clubs should not remove their old scoring software if they wish to access old sessions. Indeed (especially, for example, if they run an ongoing ladder-type event) they might choose to delay switching from PairsScorer to EBUScore until a convenient moment for consigning old events to 'archive'.
If your club uses Bridgewebs, then a quick and easy way to transfer your database is to…
These two actions are done via buttons at the bottom left of the 'Player Management' screen, screenshot below, reached via the 'Player Database' button on the Main Menu, and the 'Player Management' tab at the top (circled).
Firstly you will be asked whether or not you wish to delete your existing database. If you wish to retain Club 'player IDs' from your old database, then you will need to say 'Yes', even if there is nothing to delete!
If you do choose 'Yes', the 'deleted' database will be saved as a backup, and you see a prompt confirming this. If you choose 'No', you will get a different prompt “PIDs in the imported file will be ignored”. Either way, just click 'OK'.
Next you will need to navigate to find the 'csv' file that you have just saved - you did make a note, didn't you! (It's probably in C:\PairsScorer\Reports)
Select the file PlayerDB.csv and click on 'Open'.
That should be it!