This week
Your Mac's 19:00 notification uses the closing price and this page the live price, so their amounts can differ — a little on calm days, a lot in a fast fall. Buy each week through one of them only: pressing "I bought" here does not tell your Mac. Buy once a week, any day you like: while Xetra is open (10:00–18:30 Romanian time) the amount uses the live price; outside trading hours it uses the last close.
Over 10 years, spreading the money over the year ends up slightly behind putting each lump in at once: about €11,000 behind in normal markets, about €6,000 ahead if a crash comes early, about €60,000 behind if there is no crash for 10 years. That is the price of buying calmly. In the tests the €50,000 was not spent while SPPW was still held; if the dividends stop for good, money can still run out, which is why the income-stop rule exists.
How far these numbers go: 5,000 simulated futures built from 1999–2022 weekly prices, in today's euros (euro-area inflation). They were run for a close relative of this rule: the waiting money held in a money-market fund (as you do now), the fall measured from the highest weekly close since the start (not the all-time high), and no extra buys between Fridays. The exact rule on this page has not been simulated as a whole; expect costs of the same size.