This topic was started earlier
https://www.mql5.com/en/forum/304710
As there is little point in having 2 topics concerning the same question, please post in that topic.

MT5 Strategy Tester ERROR - MT5 Update (build 2006) Error message: "not enough available memory"??????? - (ERROR MESSAGE)
- 2019.02.24
- www.mql5.com
Since last update, one day ago, there is a message few minutes after Strategy tester Begin a portfolio backtest: " 2019.02.24 15:04:45...

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Log says:"2019.02.25 09:19:11.469 Core 1 not enough available memory, 4862 Mb used, 4282 Mb available, maximal available block is 4282 Mb
Since the last update. Before that, I had no problems. It happens when doing longterm backtests on multiple pairs (2007-2019)
computer has 16GB ram so should be no problem